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

$\text{pH = pKa+log}\frac{\text{[salt]}}{\text{[acid]}}$

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.

$\text{pH = pKa+log}\frac{\text{[salt]}}{\text{[acid]}}$

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.

$\text{pH = pKa+log}\frac{\text{[salt]}}{\text{[acid]}}$

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

$\text{pH = pKa+log}\frac{\text{[salt]}}{\text{[acid]}}$

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