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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
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. 3.0

b. 4.0

c. 5.0

d. 7.0

e. 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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