Exploring Chemical Analysis
Exploring Chemical Analysis
5th Edition
ISBN: 9781429275033
Author: Daniel C. Harris
Publisher: Macmillan Higher Education
Question
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Chapter 9, Problem 9.1P
Interpretation Introduction

Interpretation:

Addition of acid to buffer solution does not change pH of solution has to be explained.

Concept Introduction:

Buffers are those that resist pH change on addition of acid or base and even if it is diluted. It is formed by combination of weak acid and strong base or vice versa. Buffer capacity is defined as the quantity of acid or base added to volume of buffer to bring change in pH.

Expert Solution & Answer
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Explanation of Solution

Addition of acid to a buffer solution does not bring any change in pH of solution. It is due to buffer capacity that resists change in pH. In accordance to Henderson-Hasselbach equation, pH is calculated by formula as follows:

  pH=pKa+log([A][HA])

The maximum value of pH is attained when pH becomes equal to pKa and this can happen only if ratio of ([A][HA]) is one. At this condition there is no change in pH of solution.

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