   Chapter 15, Problem 10Q

Chapter
Section
Textbook Problem

# Consider a buffer solution where [weak acid] > [conjugate base]. How is the pH of the solution related to the pKa value of the weak acid? If [conjugate base] > [weak acid], how is pH related to pKa?

Interpretation Introduction

Interpretation:

The relation between the pH of the given buffer solution and the pKa value of the weak acid is to be determined.

Concept introduction:

The acidic strength of a substance can be determined using its pKa value. The lower the pKa value, the stronger is the acid.

To determine: The relation between the pH of the given buffer solution and the pKa value of the weak acid.

Explanation

Explanation

• The pH of a buffer solution is calculated by the Henderson-Hassel Balch equation,

pH=pKa+log[salt][acid]

A buffer solution where,

[Weakacid]>[Conjugatebase]

The pH of a buffer solution is calculated by the Henderson-Hassel Balch equation,

pH=pKa+log[salt][acid]

Therefore, for the given solution,

pH=pKa+log[Conjugatebase][weakacid]

Since, [Weakacid]>[Conjugatebase]

The value [Conjugatebase][weakacid] will be less than 1 .

Hence, the log[Conjugatebase][weakacid] value will be negative

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