Formula to determine Ph after Titration: pOH = -log(OH).
The pH of the solution after the addition of 300.0 ml of HBr is 1.6.
What is a Titration?Titration is a popular laboratory technique for quantitative chemical analysis to calculate the concentration of an identified analyte (also known as titrimetry and volumetric analysis) (a substance to be analyzed). A standard solution with a known concentration and volume is created as the reagent, also known as the titrant or titrator. To ascertain the concentration of the analyte, the titrant reacts with a solution of the analyte (also known as the titrant). The titration volume is the amount of titrant that interacted with the analyte.
Now;
Conc of Ca, pH of the solution before the addition of any HBr. :
pOH = -log(OH)
[OH-] = 2*[Ca(OH)2] = 2*(0.1) = 0.2 M
pOH = -log(0.2) = 0.698
pH = 14-0.698
pH = 13.3
pH of the solution after the addition of 300.0 mL HBr:
mmol of OH- = 2*MV = 2*100*0.1 = 20 mmol of OH-
mmol of H+ = MV = 0.1*V = 0.1*300= 30 mmol of HBr
left ion = 30-20 = 10 mmol of OH-
V = 100+300 = 400 mL
[H+] = 10/400 = 0.025 M
pH= -log(0.025 ) = 1.6
Formula to determine Ph after Titration: pOH = -log(OH).
The pH of the solution after the addition of 300.0 ml of HBr is 1.6.
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Which of the molecules has the highest boiling point? Enter the number of the liquid into the text entry box. Do not enter the molecular formula.
Liquid 1: CH4
Liquid 2: CH3CH3
Liquid 3: CH3CH₂CH3
Liquid 4: CH3CH₂CH₂CH3
According to the given information Liquid 2 CH3CH3 of the molecules has the highest boiling point.
What is melting and boiling point?The heat at which a quality of output into a liquid under normal air pressure is known as the melting point. Boiling point: The temperature at which a liquid's vapor pressure matches the pressure around it, turning the liquid into vapor (and vice versa).
The boiling point phase is what?The temperature from which a pure material changes from such a liquid to a liquid is known as its boiling point. The liquid's vapor pressure is now equal to the pressure being exerted on it. The boiling points point is the specific heat at one atmosphere of pressure.
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Using some of the following reagents, describe the preparation of 500 mL, pH 7 citric acid
1. 8 M citric acid
1. 2 M sodium dihydrogen citrate
1. 5 M sodium hydrogen citrate
0. 8 M sodium citrate
0. 1 M HCl
0. 1 M NaOH
Citric acid: Ka1=7. 4 x 10-4, Ka2=1. 7 x 10-5, Ka3=4. 0 x 10-7
Assume the available HCl is 10N, then take [250/(10 x 10)] = 2.5 mL into a 250 mL standard flask. Add distilled water to this, fill up to the mark and shake well.
Prepare a standard solution of Na2CO3. Take EXACTLY [53/(4 X10)] = 1.325 g of anhydrous Na2CO3 on a digital balance, dissolve in distilled water and make up the solution to 250 mL in a volumetric flask.
[Strength of Na2CO3 solution= 0.10N]
Pipette 20 ml of this solution into a clean Erlenmeyer flask, add two drops of Methyl orange indicator. The solution turns yellow.
Titrate this solution with the HCl solution by drawing on the burette. At the final stage, the color of the solution changes to light pink. Titrate the solution to achieve compliance. From this use, find out the Exact concentration of the prepared HCl solution.
250 ml 1.8 M citric acid + 92 ml 0.1 M NaOH + 158 ml distilled water
250 ml 1.8 M citric acid + 11 ml 0.1 M NaOH + 239 ml distilled water
250 ml 1.8 M citric acid + 2 ml 0.1 M NaOH + 248 ml distilled water
250 ml 0.1 M HCl + 32 ml 0.8 M sodium citrate + 218 ml distilled water
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explain the three forces at work that hold an atom together
An atom is held together by three forces: the strong nuclear force, the electromagnetic force, and the weak nuclear force.
The strong nuclear force is the strongest of the three forces and is responsible for binding the protons and neutrons together in the nucleus of an atom. The strong nuclear force is a short-range force that acts only over a very small distance, and it is strong enough to overcome the repulsive forces between the protons, which are positively charged particles.
The electromagnetic force is the second strongest of the three forces, and it is responsible for binding the electrons to the nucleus of an atom. The electromagnetic force is a long-range force that acts over a larger distance than the strong nuclear force, and it is caused by the attraction between opposite charges (positive and negative).
The weak nuclear force is the weakest of the three forces, and it is responsible for certain types of radioactive decay, such as beta decay. The weak nuclear force is a short-range force that acts only over a very small distance, and it is much weaker than the strong nuclear force and the electromagnetic force.
Overall, the three forces at work that hold an atom together are the strong nuclear force, the electromagnetic force, and the weak nuclear force. These forces act at different ranges and with different strengths, but they all play a crucial role in maintaining the stability and integrity of an atom.
chemical reactions and nuclear reactions have different kinetic behavior. what is the order for a nuclear decay reaction?
The chemical reactions and nuclear reactions have different kinetic behavior. the order for a nuclear decay reaction is first order.
The chemical reaction is the reaction in which molecules interact to form the product. while in the nuclear reaction is the type of the reaction in which the change in the structure of nucleus takes place with the release of the energy. the chemical reactions and the nuclear reaction have the different kinetic behavior. in the chemical reaction the balance term is the mass while in the nuclear reaction the balance term is the mass and the energy both.
Thus the order of the nuclear decay is the first order.
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Whose discovery led to the discovery of the proton?
A. Dalton
B. Rutherford
C. Aristotle
D. Bohr
in each reaction box, place the best reagent and conditions from the list. each reagent will only be used once and not all reagents will be used.
The reagent is the substance in the chemical reaction used to identify and measure the other substance if it is present.
The reagent is used to perform the laboratory test. The reagent are used in the chemical reaction to identify the other substance if the another substance is present . A reagent is a compound or the mixture that is added to the system and to start the chemical reaction.
Reagent are very commonly used in the laboratories for the tests. the examples is : to convert the alcohol to aldehyde and ketones , the reagent is used is the Collins reagent.
The given question is incomplete, I answer the question general answer according to my knowledge.
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Hydrogen peroxide is placed in sunlight and reacts slowly to form oxygen and water.
a. Rewrite the chemical reaction as a word equation
b. State the evidence that a chemical reaction has occurred
c. Is the reaction exothermic or endothermic? Explain your reasoning
a. The chemical reaction can be rewritten as a word equation as follows:
Hydrogen Peroxide -> Oxygen + Water
b. Evidence that a chemical reaction has occurred includes the production of a new substance (oxygen and water), a change in the physical properties of the reactants (change in color, odor, or temperature), and the release of energy (evolution of oxygen gas).
c. The reaction is likely exothermic, which means it releases energy. This is because the reaction produces new substances (oxygen and water) and releases energy in the form of oxygen gas. In an endothermic reaction, the reactants would absorb energy from the surroundings.
The hoverboard is not the best way to get to school
Write a CER 3 evidence and 3 reasonings
The justification provides the "why" and "how" the evidence substantiates the assertion.
What is justification?Justification is defined as the act, procedure, or declaration that makes sinners righteous in God's eyes. The term "research justification" refers to the justification for conducting the research, which includes a description of the research's design and methodology.
Your students may offer the following justification: Matter is air (claim). When we added more air to the ball, we discovered that the weight of the ball rose (evidence). This demonstrates that weight, a property of matter, exists in air (reasoning).
Thus, the justification provides the "why" and "how" the evidence substantiates the assertion.
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16. the electron configuration of nitrogen is how many more electrons does nitrogen need to satisfy the octet rule?
3 On the periodic table, column 5 contains nitrogen, denoted by the letter N.Its valence electron count is 5.To obtain an octet, three linkages must be created.The straightforward formula is 5 + 3 = 8.
The octet law applies to nitrogen, right?The second row of the p-block area includes fluorine, oxygen, nitrogen, and carbon.When they combine, these elements closely adhere to the octet rule.In order to complete their octet, for instance, these elements combine with hydrogen to make two to four bonds.
For nitrogen to have a complete valence, how many additional electrons are required?Two nitrogen atoms would have a total of 10 valence electrons if the entire number of valence electrons in nitrogen, which is five, were to be doubled.A triple bond is necessary for the octet since it needs 8 total electrons for an atom to have a full valence shell.
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- If Earth's rate of rotation decreased, there
would be an increase in the
(1) length of the seasons
(2) sun's angle of insolation at noon
(3) number of observable stars seen at night
during the year
(4) length of an Earth day
Answer: length of an earth day
Explanation:
Describe what happens at the molecular level when a substance is heated first to its melting point and then to its boiling point.
When one substance melts, we just seperate the molecules. Because the temperature required to change from solid to liquid is less than the temperature needed to change from liquid to gas.
What is Melting point?The melting point of a substance or compound is defined as the temperature at which it changes from solid state to liquid state. At the melting point, the solid and liquid state exist in the equilibrium stage. The melting point of the substance always depends on pressure.
What is Boiling point?The boiling point of a substance or compound is defined as the temperature at which it changes from liquid state to gaseous state. At the boiling point, the gas and liquid state exist in the equilibrium stage. The boiling point of the substance always depends on pressure.
As we know that,
When a substance is boiled, the molecules of that particular substance completely break.Thus, we concluded that when one substance melts, we just seprate the molecules. Because the temperature required to change from solid to liquid is less than the temperature needed to change from liquid to gas.
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Calcium hydroxide solution and carbon dioxide gas yields solid calcium carbonate and liquid water
Calcium hydroxide reacts with carbon dioxide gives water and calcium carbonate. The balanced equation for the reaction is written as:
[tex]\rm Ca(OH)_{2} + CO_{2} \rightarrow CaCO_{3} + H_{2}O[/tex]
What is calcium carbonate?Calcium carbonate is commonly called limestone. Limestone is mineral deposit found in many living and nonliving things. Rocks and shells of some organisms are major sources of calcium carbonate.
Calcium carbonate can be prepared by passing carbon dioxide through quicklime or calcium oxide CaO. Calcium carbonate will precipitate in a milky solution.
Limestone can also be prepared by the reaction of calcium hydroxide or soda lime with carbon dioxide. Each reacts in one mole and gives one mole of each product as written in the balanced reaction.
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Your question is incomplete. But your complete question probably was:
Calcium hydroxide solution and carbon dioxide gas yields solid calcium carbonate and liquid water. Write the balanced equation for this reaction.
because strong attractive forces hold the layers in an ionic crystal in relatively fixed positions, ionic compounds:______.
Answer:
Because strong attractive forces hold the layers in an ionic crystal in relatively fixed positions, ionic compounds are hard, brittle, and not electrical conductors as solids.
Explanation:
i hope this helped
paulas choice--skin perfecting 2% bha liquid salicylic acid exfoliant--facial exfoliant for blackheads, enlarged pores, wrinkles & fine lines, 4 oz bottle
An excellent exfoliating product, however if you have sensitive skin you shouldn't use it every day or you'll harm your skin barrier.
Is Paula's Choice BHA effective on blackheads?However, the benefits of our BHA solutions are not limited to treating blemishes, blackheads, and enlarged pores; they also benefit skin by including moisturizing and anti-aging components. There is a BHA option that will be ideal for your skin type and skin issues among the numerous available from Paula's Choice Skincare.
Can Paula's Choice BHA reduce pore size?Salicylic acid (also known as beta hydroxyl acid or BHA) aids in shedding the dead skin cells that would otherwise accumulate in the pore and stretch it out. BHA exfoliates inside enlarged pores to help them shrink back to their original size.
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714.0g of KBr will decompose fully to produce how many liters of Bromine gas?
2KBr (s) → 2K (s) + Brz (g)
One of the reactant atoms in a redox reaction undergoes oxidation while the other undergoes reduction.
What are Redox Reactions?An electron transfer between two reactants that are involved in a chemical reaction is known as a redox reaction. Observing variations in the oxidation states of the reacting species will help you spot this transfer of electrons.Below is an illustration of a redox reaction showing the transport of electrons between two reactants.As seen in the image below, reactant A underwent an oxidation reaction after losing an electron, which is the reactant. Similar to reactant A, reactant B also received an electron, resulting in reduction.Oxidation is the process of a given reactant losing electrons and changing from a reduced to a more oxidized state. Reduction is the process of adding electrons to a reactant and causing it to become less oxidised.The term "oxidizing agents" refers to electron-accepting species that have a tendency to reduce redox processes. A reducing agent is an electron-donating substance that typically gives away electrons. Oxidation is a common process for these species. It should be noted that any redox reaction can be divided into the oxidation half-reaction and the reduction half-reaction.The Complete Question is redox Reaction.
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5
volume (cm³)
1. Based on this graph, how does metal B differ from metal A?
2. What is the density of metal B? Show all your work and include appropriate units.
3. What is the mass of 9.0 cm³ of metal B? Find this in two different ways.
a. Mark on the above graph how you might determine this.
b. Show how you could calculate this mathematically.
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, Metal A is lesser denser than metal B.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the metal ball ÷volume marked on the graduated cylinder
Since mass of metal a and metal B is same, so now density depend on volume. Volume of metal A is higher than metal B. From formula we can see density is inversely proportional to volume. So, Metal A is lesser denser than metal B.
Therefore, Metal A is lesser denser than metal B.
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what would have happened to the reaction rate if the calcium carbonate has been crushed into a powder? explain, using the collision theory
It is not the concentration of Caco₃ reactant present that determines the rate of the calcination reaction.
Cacao₃ (s) ←→ CaO(s) + CO 2 (g)
Calcium Carbonate:
Calcium carbonate is a compound with the chemical formula CaCO3. It is a common substance found in rocks such as calcite and aragonite (primarily limestone, a type of sedimentary rock composed primarily of calcite) and is a major component of eggshells, snail shells, seashells and pearls. A substance containing a lot of calcium carbonate or a substance similar to calcium carbonate is called calcareous. Calcium carbonate is the active ingredient in agricultural lime and is formed when calcium ions in hard water react with carbonate ions to form scale deposits.
Now,
Since the CO₂ produced in this reaction must escape from the interior of the Caco₃ particles, the decrease at any temperature of the reaction speed is determined. This is determined by the size of the solid calcium carbonate particles and the partial pressure of CO₂ surrounding the particles.
Grinding Cacao₃ into a fine powder greatly reduces the average distance that a CO₂ molecule must travel to escape each particle, thus accelerating the reaction rate.
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nuclear decay occurs according to first-order kinetics. how long will it take for a sample of chromium-51 to decay from 35.0 grams to 10.0 grams? the half-life of chromium-51 is 28 days.
In 84 days, the amount of chromium-51 in this sample will decrease from 35 grams to 10 grams.
Explain what nuclear is.Nuclear energy is the name given to the energy that can be found in the nucleus, or core, of an atom. Atoms are the smallest units that make up the universe, and energy holds the nucleus of each atom together.
Who has nuclear power on the planet?The largest nuclear electricity generator in 2021 will be the United States, which will generate 771,638 GWh of nuclear energy, followed by China, which will generate 383,205 GWh. As of August 2022, 438 reactors with a net power of 393,333 MWe and 56 reactors with a combined total of 57,848 MWe were in operation.
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if aluminum nitrate and sodium hydroxide are reacted, what is the resultant clear jelly-like precipitate that forms but disappears as more reagent is added?
Sodium hydroxide to a cylinder of aluminum nitrate to precipitate the aluminum hydroxide. Add more base to dissolve the precipitate.
The reaction can then be reversed by adding hydrochloric acid. Sodium hydroxide replaces copper forming copper hydroxide. Instead of dissolving the compound precipitates and appears as a light blue solid in the liquid. At this point, the solution becomes colorless and solid copper hydroxide settles to the bottom.
All ions dissolve in each other and do not react with each other. So the short answer to this question is nothing. When NaOH and KCl react KOH and NaCl are formed. Such reactions are called double displacement reactions. Silver ions come out of the solution as a brown precipitate of silver oxide in the presence of hydroxide ions.
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Listed in the Item Bank are key terms and expressions, each of which is associated with one of the columns. Some terms may display additional information when you click on them. Drag and drop each item into the correct column. Order does not matter.
Answer:
Elements: U and Li
Compounds: [tex]H_2O[/tex], [tex]MgCl_2[/tex], and [tex]Li(OH)_2[/tex]
Explanation:
Elements are pure substances that are not bonded with any other atom. They are found in the Periodic Table of Elements. For this question, only U and Li are pure substances, they are the only items listed in the Periodic Table, and they are the only elements in the list.
Compounds are groups of elements that are chemically bonded. When writing them, the elements that compose them are listed. [tex]H_2O[/tex] is two hydrogen and one water, [tex]MgCl_2[/tex] is one magnesium and two chlorine, and [tex]Li(OH)_2[/tex] is one lithium and two hydroxide ions. The two hydroxide ions are composed of one hydrogen and one oxygen each. These three items are all compounds of various elements.
which molecule below has hydrogen bonding? which molecule below has hydrogen bonding? hf ch3oh nh3 h2o all of the above
Hydrogen bonds exist in the water molecule below.
What are the three components of a hydrogen bond?Only molecules in which hydrogen is covalently bound to either fluorine, oxygen, or nitrogen experience hydrogen bonding. These three elements are sufficiently electronegative that they remove the majority of the electron density from the hydrogen atom's covalent link, leaving the latter atom with an extremely low electron density.
How does a hydrogen bond develop?A hydrogen atom that is connected to an electronegative atom moves toward another electronegative atom nearby to form hydrogen bonds, which are potent intermolecular forces. The hydrogen-bond strength will rise as the hydrogen bond acceptor's electronegativity increases.
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balancing chemical equations
N₂(g) + H₂(g) → NH₂
please help lol
Answer:
N2 + 3H2 => 2NH3
Explanation:
N2 + 3H2 => 2NH3
N = 2
H = 6
It's NH3, not NH2
PLEASE HELP ME WITH THIS QUESTION
If the volume is decreased to 2.6 L and pressure is decreased to 3.2 atm, then temperature become 156.98K.
This problem can be solved by using the concept of Ideal gas equation.
What ia ideal gas equation?The equation of ideal gas can be expressed as
PV = nRT
where,
P is the pressure of the gas
V is the volume taken
n is the number of moles of the gas
R is the gas constant = 6.314 J/ mol K
T is the temperature
Now from given data, we have the values of
V = 3.2 L
P = 5.5 atm
T = 53°C = 273 + 53 = 326 K
By substituting all the values, we get the value of n
3.2 × 5.5 = n × 6.314 × 326
17.6 = n × 2058.36
n = 17.6 / 2058.36
n = 0.0085 mol
Now, we have to find the temperature
n = 0.0085 mol
V = 2.6 L
P = 3.2 atm
By substituting all the values, we get
3.2 × 2.6 = 0.0085 × 6.314 × T
8.32 = 0.053 T
T = 8.32/ 0.053
T = 156.98 K
Thus, we concluded that if the volume is decreased to 2.6 L and pressure is decreased to 3.2 atm, then temperature become 156.98K.
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when the concentrations of both mercury chloride and oxalate ion are 0.30 m, what is the rate of the reaction?
The concentrations of both mercury chloride and oxalate ion are 0.30 m, the rate of the reaction is 7.8 × 10⁻⁴ M/s.
given that :
concentration of mercury chloride = 0.30 M
concentration of oxalate ion = 0.30 M
It can be written as:
2HgCl₂ + C₂O₄²⁻ -----> 2Cl⁻ + Hg₂Cl₂ + 2CO₂
k = 8.7 × 10⁻³ M⁻²/s⁻¹
The rate of the reaction will be shown as :
Rate = k [HgCl₂ ] [ C₂O₄²⁻ ]²
Rate = 8.7 × 10⁻³ (0.30)(0.30)²
Rate = 7.8 × 10⁻⁴ M/s
Thus, rate of the reaction will be :
Rate = 7.8 × 10⁻⁴ M/s
This question is incomplete , the complete question is :
__""when the concentrations of both mercury chloride and oxalate ion are 0.30 m, what is the rate of the reaction? "__
the rate is given as : Rate = k[HgCl₂ ] [ C₂O₄²⁻ ]² value of k = 8.7 × 10⁻³ M⁻²/s⁻¹__"
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Can ya help me know what goes in the blanks
Answer:
In the explanation below
Explanation:
Fusion
Heat
Friction
127
Radiation
If you connect the words it'll make sense. Use the ways of the Taoists.
How many grams of CO would be required to generate 635 g CO2?
Fe2O3 + 3CO → 2Fe + 3CO2 CO: 28.01 g/mol CO2: 44.01 g/mol
[?] g CO₂
The amount of CO that would be required to generate 635 g of CO₂ will be 404.14 g.
What is stoichiometric co-efficient?To balance the amount of each element on the reactant and product sides of the equation, the stoichiometric coefficient is the number placed in front of the atoms, ions, and molecules in a chemical process.
Usually, it is positive for products and negative for reactants. Stoichiometric coefficients define the stoichiometry of a chemical reaction.
First, let us get the equation of the reaction:
The reaction becomes: Fe₂O₃ + 3CO → 2Fe + 3CO₂
From the equation, we can see that the mole ratio of CO to that of CO₂
= 3:3
= 1:1
Given that,
635 g of CO₂ is to be generated.
Mole of 635 g CO₂ = mass/molar mass = 635/44.01 = 14.43 moles
Thus, the equivalent mole of CO required will also be 14.43 moles.
Mass of 14.43 moles of CO = moles x molar mass
= 14.43 x 28.01
= 404.14 gm.
Hence, 404.14 gm of CO will be required to produce 635 g of CO₂.
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if 0.900 g of oxalic acid, h2c2o4, is completely neutralized with 0.500 m lithium hydroxide, what volume of lithium hydroxide is required?
In order to completely neutralize 0.900 g liquid oxalic acid, h2c2o4, using 0.500 m lithium hydroxide, 40.00 ml of lithium hydroxide are needed.
What purpose does lithium hydroxide serve?When manufacturing lithium salts (soaps) of oleic and other fatty acids, lithium hydroxide (LiOH), which is frequently produced by the reaction of lithium carbonate and lime, is utilized. These soaps are commonly used as thickeners for lubricating greases.
How is static power calculated?ICC times the supply voltage equals static power dissipation. In CMOS logic, the current that occurs as the input switches between High and Low is known as the dynamic supply current. This current circulates when capacitance is being charged and discharged.
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A titration curve is a plot of choose. On the x-axis and choose. On the y-axis.
A titration curve is a plot of titrant volume on the x-axis and pH on the y-axis.
What is a titration curve?
Titration is often plotted on a graph called a titration curve. This graph usually contains the titrant volume as the independent variable and the pH of the solution as the dependent variable. The equivalence point on the graph is where all the starting solution has been neutralized by the titrant.
What is a titrant volume?
Reagents, called titrants or titrators, are prepared as standard solutions. A titrant of known concentration and volume reacts with the analyte solution or titrant to determine the concentration. The amount of titrant converted is called titer.
Therefore, A titration curve is a plot of titrant volume on the x-axis and pH on the y-axis.
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4. A 0.50 M solution of sodium thiosulfate, Na2S2O3 is used to create a more dilute solution. If 250 mL of the concentrated solution is diluted to a volume of 2.5 L, determine the concentration of the new solution.
The concentration of the new solution if 0.50 M solution of sodium thiosulfate is used to create a more dilute solution is 0.05M.
How to calculate concentration?Molarity refers to the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The concentration of a solution can be calculated using the following formula:
CaVa = CbVb
Where;
Ca = initial concentrationCb = final concentrationVa = initial volumeVb = final volumeAccording to this question, if 250 mL of the concentrated solution is diluted to a volume of 2.5 L, the new concentration can be calculated as follows:
0.250 × 0.5 = 2.5 × Cb
0.125 = 2.5Cb
Cb = 0.05M
Therefore, 0.05M is the new concentration of the solution.
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Two astronauts are in outer space; hank is inside the space shuttle & the other, sally, is on a space walk. A large meteor hits the space shuttle, but only one of the two astronauts are able to hear it. Which astronaut is able to hear the impact & which isn’t. Explain why. Be sure to include the terms: medium and transfer in your explanation.
Answer:
Sally would not be able to hear the impact of the meteor because sound waves cannot travel through the vacuum of outer space. In order for sound to be heard, it must vibrate through a medium such as air, water, or solid matter. Since there is no air or other medium in outer space, sound waves cannot transfer through it and cannot be heard. Hank, on the other hand, would be able to hear the impact of the meteor because he is inside the space shuttle, which provides a solid medium for the sound waves to vibrate through and be transferred to his ear drums.