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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

Phosphate buffers are important in regulating the pH of intracellular fluids at pH values generally between 7.1 and 7.2.

a. What is the concentration ratio of H2PO4 to HPO42− in intracellular fluid at pH = 7.15?

H 2 PO 4 ( a q ) HPO 4 2 ( a q ) + H + ( a q ) K a = 6.2 × 10 8

b. Why is a buffer composed of H3O4 and H2PO4 ineffective in buffering the pH of intracellular fluid?

H 3 PO 4 ( a q ) H 2 PO 4 ( a q ) + H + ( a q ) K a = 7.5 × 10 3

(a)

Interpretation Introduction

Interpretation:

Phosphate buffers have been stated to be important in regulating the pH of intercellular fluids at pH values generally between 7.1 and 7.2 . The given questions based on phosphate buffers are to answered.

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

To find the value of pKa

The value of pKa is calculated by the formula,

pKa=log(Ka)

Substitute the value of Ka in the above expression.

pKa=log(6.2×108)=7.21_

To find the concentration ratio of H2PO4 and HPO42 in intracellular fluid at

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

pH=pKa+log[Salt][Acid]

The calculated value of pKa is 7.21 .

Substitute the value of pKa and the given value of pH in the Henderson-Hasselbach equation.

7.5=7

(b)

Interpretation Introduction

Interpretation:

Phosphate buffers have been stated to be important in regulating the pH of intercellular fluids at pH values generally between 7.1 and 7.2 . The given questions based on phosphate buffers are to answered.

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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