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11 Dec 2019

Endgroup analysis by titration: 7.5 mols of 1,4-diaminobutane were reacted with 7.5 mols of terepthalic acid. After the reaction, a titration was performed using KOH. If 58 mL of 2.5 M KOH were used to neutralize the residual âCOOH groups, what is the MN of the polymer?

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Molecular Weight Determination Methods

1. Calculate M_n, M_w and the polydispersity index for a hypothetical polymer sample that contains equimolar amounts of polymer having molecular weights of 25,000, 50,000, 75,000 and 100,000.

2. Change the words in problem 1 from equimolar amounts to equal weights and recalculate.

3. A 0.750 g sample of polyester was reacted with excess acetic anhydride (polyesters have carboxylic acid and alcohol and groups â and acetic anhydride will react with the terminal alcohol groups to make an ester with acetic acid as a byproduct). Titration of the reaction mixture required 11.45 ml of 0.0102 M KOH. What is Mn for this polymer sample?

1) A 24.00 âmL sample of an unknown HClO4 solution requires titration with 22.82 mL of 0.1900 M NaOH to reach the equivalence point.
What is the concentration of the unknown HClO4 solution? The neutralization reaction is:
HClO4(aq)+NaOH(aq)âH2O(l)+NaClO4(aq)

2) A 25.00 mL sample of an unknown H3PO4 solution is titrated with a 0.100 M NaOH solution. The equivalence point is reached when 26.33 mL of NaOH solution is added.
What is the concentration of the unknown H3PO4 solution?

3) An acid solution is 0.100 M in HCl and 0.200 M in H2SO4.
What volume of a 0.140 M KOH solution would have to be added to 550.0 mL of the acidic solution to neutralize completely all of the acid?

4) A tanker truck carrying 2.01Ã10³ kg of concentrated sulfuric acid solution tips over and spills its load. The sulfuric acid solution is 95.0% H2SO4 by mass and has a density of 1.84 g/mL.
Sodium carbonate (Na2CO3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be added to neutralize 2.01Ã10³ kg of sulfuric acid solution?

A titration is a procedure for determining the concentration of a solution by allowing it to react with another solution of known concentration (called a standard solution). Acid-base reactions and oxidation-reduction reactions are used in titrations. For example, to find the concentration of an HCl solution (an acid), a standard solution of NaOH (a base) is added to a measured volume of HCl from a calibrated tube called a buret. An indicator is also present and it will change color when all the acid has reacted. Using the concentration of the standard solution and the volume dispensed, we can calculate molarity of the HCl solution.

A) A volume of 90.0 mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 14.7 mL of 1.50 M H2SO4 was needed? The equation is 2KOH(aq)+H2SO4(aq)âK2SO4(aq)+2H2O(l)

B) Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the reaction:

2KMnO4(aq)+H2O2(aq)+3H2SO4(aq)â3O2(g)+2MnSO4(aq)+K2SO4(aq)+4H2O(l)

A certain amount of hydrogen peroxide was dissolved in 100. mL of water and then titrated with 1.68 M KMnO4. What mass of H2O2 was dissolved if the titration required 18.8 mL of the KMnO4 solution?

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Endgroup analysis by titration: 7.5 mols of 1,4-diaminobutane were reacted with 7.5 mols of terepthalic acid. After the reaction, a titration was performed using KOH. If 58 mL of 2.5 M KOH were used to neutralize the residual âCOOH groups, what is the MN of the polymer?

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Endgroup analysis by titration: 7.5 mols of 1,4-diaminobutane were reacted with 7.5 mols of terepthalic acid. After the reaction, a titration was performed using KOH. If 58 mL of 2.5 M KOH were used to neutralize the residual âCOOH groups, what is the MN of the polymer?

Related textbook solutions

Basic Chemistry

Principles of Chemistry Molecular Approach

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related questions

Weekly leaderboard

Endgroup analysis by titration: 7.5 mols of 1,4-diaminobutane were reacted with 7.5 mols of terepthalic acid. After the reaction, a titration was performed using KOH. If 58 mL of 2.5 M KOH were used to neutralize the residual âCOOH groups, what is the MN of the polymer?