   Chapter 15, Problem 85AE

Chapter
Section
Textbook Problem

# You have the following reagents on hand: Solids (pKa of Acid Form Is Given) Solutions Benzoic acid (4.19) 5.0 M HCI Sodium acetate (4.74) 1.0 M acetic acid (4.74) Potassium fluoride (3.14) 2.6 M NaOH Ammonium chloride (9.26) 1.0 M HOCI (7.46) What combinations of reagents would you use to prepare buffers at the following pH values?a. 3.0b. 4.0c. 5.0d. 7.0e. 9.0

(a)

Interpretation Introduction

Interpretation:

The correct combination from the given reagents that can be used to prepare buffers at the given pH values.

Concept introduction:

A solution that resists a change in the pH on addition of an acid or an alkali is termed as a buffer solution.

Explanation

Explanation

The given pH value is 3.0 .

A buffer shows the presence of equal quantities of the weak acid and its conjugate base. Hence, the ratio, [Salt][Acid] , for a buffer solution is approximately equal to 1 .

The relation between pH and pKa is given by Henderson-Hasselbach equation. According to this equation,

pH=pKa+log[Salt][Acid]

Hence, to make a b

(b)

Interpretation Introduction

Interpretation:

The correct combination from the given reagents that can be used to prepare buffers at the given pH values.

Concept introduction:

A solution that resists a change in the pH on addition of an acid or an alkali is termed as a buffer solution.

(c)

Interpretation Introduction

Interpretation:

The correct combination from the given reagents that can be used to prepare buffers at the given pH values.

Concept introduction:

A solution that resists a change in the pH on addition of an acid or an alkali is termed as a buffer solution.

(d)

Interpretation Introduction

Interpretation:

The correct combination from the given reagents that can be used to prepare buffers at the given pH values.

Concept introduction:

A solution that resists a change in the pH on addition of an acid or an alkali is termed as a buffer solution.

(e)

Interpretation Introduction

Interpretation:

The correct combination from the given reagents that can be used to prepare buffers at the given pH values.

Concept introduction:

A solution that resists a change in the pH on addition of an acid or an alkali is termed as a buffer solution.

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