Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN: 9781305079373
Author: William L. Masterton, Cecile N. Hurley
Publisher: Cengage Learning
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Chapter 14, Problem 27QAP
Interpretation Introduction

(a)

Interpretation:

The buffer capacity of 0.250 M lactic acid and 0.250 M lactate ion should be determined.

Concept introduction:

A buffer is a solution which resists change in pH on addition of small amount of acid or base. A buffer is prepared by mixing a weak acid with its conjugate base ion or a weak base and its conjugate acid ion.

For example the mixture of acetic acid and its conjugate base acetate ion will form a buffer solution.

The pH of a buffer solution is determined with the following equation

pH = pKa+log[salt][acid]

Also known as Henderson Hasselbalch’s equation

The buffer capacity is the capacity of a buffer to which it can resist a major change in pH on addition of acid or base.

It is dependent on the ratio of concentration of weak acid and concentration of its conjugate base.

Interpretation Introduction

(b)

Interpretation:

The buffer capacity of 0.250 M lactic acid and 0.125 M lactate ion should be determined.

Concept introduction: A buffer is a solution which resists change in pH on addition of small amount of acid or base. A buffer is prepared by mixing a weak acid with its conjugate base ion or a weak base and its conjugate acid ion.

For example the mixture of acetic acid and its conjugate base acetate ion will form a buffer solution.

The pH of a buffer solution is determined with the following equation.

pH = pKa+log[salt][acid]

Also known as Henderson Hasselbalch’s equation

The buffer capacity is the capacity of a buffer to which it can resist a major change in pH on addition of acid or base.

It is dependent on the ratio of concentration of weak acid and concentration of its conjugate base

Interpretation Introduction

(c)

Interpretation:

The buffer capacity of 0.250 M lactic acid and 0.0800 M lactate ion should be determined.

Concept introduction: A buffer is a solution which resists change in pH on addition of small amount of acid or base. A buffer is prepared by mixing a weak acid with its conjugate base ion or a weak base and its conjugate acid ion.

For example the mixture of acetic acid and its conjugate base acetate ion will form a buffer solution.

The pH of a buffer solution is determined with the following equation.

pH = pKa+log[salt][acid]

Also known as Henderson Hasselbalch’s equation

The buffer capacity is the capacity of a buffer to which it can resist a major change in pH on addition of acid or base.

It is dependent on the ratio of concentration of weak acid and concentration of its conjugate base

(d)

Interpretation Introduction

Interpretation:

The buffer capacity of 0.250 M lactic acid and 0.0500 M lactate ion should be determined.

Concept introduction:

A buffer is a solution which resists change in pH on addition of small amount of acid or base. A buffer is prepared by mixing a weak acid with its conjugate base ion or a weak base and its conjugate acid ion.

For example the mixture of acetic acid and its conjugate base acetate ion will form a buffer solution.

The pH of a buffer solution is determined with the following equation

pH = pKa+log[salt][acid]

Also known as Henderson Hasselbalch’s equation

The buffer capacity is the capacity of a buffer to which it can resist a major change in pH on addition of acid or base.

It is dependent on the ratio of concentration of weak acid and concentration of its conjugate base

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Which of the following aqueous solutions are good buffer systems? O 0.14 M hypochlorous acid + 0.18 M potassium hypochlorite D0.29 M ammonium bromide + 0.32 M ammonia O 0.37 M nitrous acid + 0.25 M sodium nitrite O 0.17 M sodium cyanide + 0.28 M hydrocyanic acid D0.30 M hydroiodic acid + 0.17 M potassium iodide
(a) Calculate the pH of the 0.30 M NH3 / 0.35 M NH4Cl buffer.   What is the pH of the buffer after the addition of 0.030 mol HCl?   note: Ka  (NH4+) = 5.6 x 10 -10   NH3 (aq) + H+ (aq) → NH4+ (aq)   (b) What are the hydronium [H3O+] and hydroxide [OH-] ion concentrations at 25°C in a 4.0 M aqueous Mg(OH)2.
Calculate the pH of each of the following buffered solutions. Ka(HC, HgO,)= 1.8 × 10 5 1.0.19 M acetic acid/0.29 M sodium acetate pH = 2. 0.29 M acetic acid/0.19 M sodium acetate pH = 3. 0.060 M acetic acid/0.21 M sodium acetate pH = 4. 0.21 M acetic acid/0.060 M sodium acetate pH = Visited

Chapter 14 Solutions

Chemistry: Principles and Reactions

Ch. 14 - A buffer is prepared by dissolving 0.0250 mol of...Ch. 14 - A buffer is prepared by dissolving 0.062 mol of...Ch. 14 - A buffer solution is prepared by adding 15.00 g of...Ch. 14 - A buffer solution is prepared by adding 5.50 g of...Ch. 14 - A solution with a pH of 9.22 is prepared by adding...Ch. 14 - An aqueous solution of 0.057 M weak acid, HX, has...Ch. 14 - Which of the following would form a buffer if...Ch. 14 - Which of the following would form a buffer if...Ch. 14 - Calculate the pH of a solution prepared by mixing...Ch. 14 - Calculate the pH of a solution prepared by mixing...Ch. 14 - Calculate the pH of a solution prepared by mixing...Ch. 14 - Calculate the pH of a solution prepared by mixing...Ch. 14 - Consider the weak acids in Table 13.2. Which...Ch. 14 - Prob. 24QAPCh. 14 - A sodium hydrogen carbonate-sodium carbonate...Ch. 14 - You want to make a buffer with a pH of 10.00 from...Ch. 14 - Prob. 27QAPCh. 14 - The buffer capacity indicates how much OH- or H+...Ch. 14 - A buffer is made up of 0.300 L each of 0.500 M...Ch. 14 - A buffer is made up of 239 mL of 0.187 M potassium...Ch. 14 - Enough water is added to the buffer in Question 29...Ch. 14 - Enough water is added to the buffer in Question 30...Ch. 14 - A buffer is prepared in which the ratio [ H2PO4...Ch. 14 - A buffer is prepared using the butyric...Ch. 14 - Blood is buffered mainly by the HCO3 H2CO3 buffer...Ch. 14 - There is a buffer system in blood H2PO4 HPO42 that...Ch. 14 - Given three acid-base indicators—methyl orange...Ch. 14 - Given the acid-base indicators in Question 37,...Ch. 14 - Metacresol purple is an indicator that changes...Ch. 14 - Thymolphthalein is an indicator that changes from...Ch. 14 - When 25.00 mL of HNO3 are titrated with Sr(OH)2,...Ch. 14 - A solution of KOH has a pH of 13.29. It requires...Ch. 14 - A solution consisting of 25.00 g NH4Cl in 178 mL...Ch. 14 - A 50.0-mL sample of NaHSO3 is titrated with 22.94...Ch. 14 - A sample of 0.220 M triethylamine, (CH3CH2)3 N, is...Ch. 14 - A 35.00-mL sample of 0.487 M KBrO is titrated with...Ch. 14 - A 0.4000 M solution of nitric acid is used to...Ch. 14 - A 0.2481 M solution of KOH is used to titrate...Ch. 14 - Consider the titration of butyric acid (HBut) with...Ch. 14 - Morphine, C17H19O3N, is a weak base (K b =7.4107)....Ch. 14 - Consider a 10.0% (by mass) solution of...Ch. 14 - A solution is prepared by dissolving 0.350 g of...Ch. 14 - Prob. 53QAPCh. 14 - Ammonia gas is bubbled into 275 mL of water to...Ch. 14 - For an aqueous solution of acetic acid to be...Ch. 14 - Prob. 56QAPCh. 14 - Prob. 57QAPCh. 14 - Water is accidentally added to 350.00 mL of a...Ch. 14 - A solution of an unknown weak base...Ch. 14 - Consider an aqueous solution of HF. The molar heat...Ch. 14 - Each symbol in the box below represents a mole of...Ch. 14 - Use the same symbols as in Question 61 ( = anion,...Ch. 14 - The following is the titration curve for the...Ch. 14 - Prob. 64QAPCh. 14 - Follow the directions of Question 64. Consider two...Ch. 14 - Prob. 66QAPCh. 14 - Indicate whether each of the following statements...Ch. 14 - Prob. 68QAPCh. 14 - Consider the following titration curves. The...Ch. 14 - Consider the titration of HF (K a=6.7104) with...Ch. 14 - The species called glacial acetic acid is 98%...Ch. 14 - Four grams of a monoprotic weak acid are dissolved...Ch. 14 - Prob. 73QAPCh. 14 - Fifty cm3 of 1.000 M nitrous acid is titrated with...Ch. 14 - A diprotic acid, H2B(MM=126g/moL), is determined...Ch. 14 - Prob. 76QAPCh. 14 - Two students were asked to determine the Kb of an...Ch. 14 - How many grams of NaOH must be added to 1.00 L of...Ch. 14 - How many grams of NaF must be added to 70.00 mL of...Ch. 14 - Prob. 80QAP
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