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 9.8P

(a)

Interpretation Introduction

Interpretation:

The ratio of [CH3NH2][CH3NH3+] at pH equals to 4 has to be calculated.

Concept Introduction:

The equation for buffer is described by Henderson-Hasselbach equation and it is a rearranged form of equilibrium constant, Ka. It relates pH of buffer solution and pKa value. It also helps to find equilibrium pH in acid-base reactions. Consider an equation of dissociation of an acid as follows:

  HAH++A

Formula to calculate pH is as follows:

  pH=pKa+log([A][HA])

Here,

pKa is acid dissociation constant of weak acid HA.

[A] is concentration of conjugate base A

[HA] is concentration of acid HA.

(b)

Interpretation Introduction

Interpretation:

The ratio of [CH3NH2][CH3NH3+] at pH equals to 10.632 has to be calculated.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The ratio of [CH3NH2][CH3NH3+] at pH equals to 4 has to be calculated.

Concept Introduction:

Refer to part (a).

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