Chapter 11, Problem 11.3P

Interpretation Introduction

Interpretation:

Value of $K_{a1}$, $K_{a2}$ and $K_{a3}$ from base association constants have to be calculated.

Concept Introduction:

$K_{\text{a}}$ for reaction is defined as acid dissociation constant. It helps to determine the amount of hydrogen ions in acid. $K_{\text{b}}$ for reaction is defined as base association constant. It helps to determine the amount of hydroxide ions in base.

The relation between $K_a$ and $K_{\text{b}}$ for triprotic system is as follows:

  $\begin{array}{l}\left(K_{a1}\right)\left(K_{\text{b3}}\right)=K_{\text{w}}\\ \left(K_{a2}\right)\left(K_{\text{b2}}\right)=K_{\text{w}}\\ \left(K_{a3}\right)\left(K_{\text{b1}}\right)=K_{\text{w}}\end{array}$

Here,

$K_{a1}$, $K_{a2}$ and $K_{a3}$ is first, second and third acid dissociation constant respectively.

$K_{\text{b1}}$, $K_{\text{b2}}$ and $K_{\text{b3}}$ is first, second and third base dissociation constant respectively.

$K_{\text{w}}$ is dissociation constant of water.