Chapter 9, Problem 9.6P

(a)

Interpretation Introduction

Interpretation:

The ratio of $\frac{\left[{\text{HIO}}_3\right]}{\left[{\text{IO}}_3^{-}\right]}$ at $\text{pH}$ equals to 7 has to be calculated.

Concept Introduction:

The equation for buffer is described by Henderson-Hasselbach equation and it is a rearranged for of equilibrium constant, $K_{\text{a}}$. Consider an equation of dissociation of base is as follows:

  ${\text{H}}^{+}+\text{B}\rightleftharpoons {\text{BH}}^{+}$

Formula to calculate $\text{pH}$ is as follows:

  $\text{pOH}=p{K}_{\text{b}}+\log \left(\frac{\left[{\text{BH}}^{+}\right]}{\left[\text{B}\right]}\right)$

Here,

$p{K}_{\text{b}}$ is base dissociation constant of weak base $\text{BH}$.

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

$\left[{\text{BH}}^{+}\right]$ is concentration of acid ${\text{BH}}^{+}$.

(b)

Interpretation Introduction

Interpretation:

The ratio of $\frac{\left[{\text{HIO}}_3\right]}{\left[{\text{IO}}_3^{-}\right]}$ at $\text{pH}$ equals to 1 has to be calculated.

Concept Introduction:

Refer to part (a).