Chapter 10, Problem 10.18P

(a)

Interpretation Introduction

Interpretation:

Value of $\text{pH}$ for solution made from $\text{NaCN}$ and ${\text{HClO}}_4$ has to be calculated.

Concept Introduction:

Formula to compute $\text{pH}$ for a  basic buffer is as follows:

  $\text{pH}=\text{p}{K}_{\text{a}}+\log \left(\frac{\left[\text{Base}\right]}{\left[\text{Salt}\right]}\right)$

Here,

$\text{p}{K}_{\text{a}}$ is characteristic of a weak acid.

$\left[\text{Salt}\right]$ denotes the concentration of salt formed.

$\left[\text{Base}\right]$ is concentration of base.

(b)

Interpretation Introduction

Interpretation:

Value of $\text{pH}$ for solution made from $\text{NaCN}$ and $\text{11}{\text{.82 mL HClO}}_4$ has to be calculated.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Value of $\text{pH}$ at the equivalence point from $\text{NaCN}$ and $\text{0}{\text{.438 M HClO}}_4$ has to be calculated.

Concept Introduction:

Refer to part (a).