Chapter 11, Problem 11.11P

Interpretation Introduction

Interpretation:

Value of $\text{pH}$ of a solution of dibasic compound piperazine $\left(\text{B}\right)$ has to be calculated. Also concentration of $\text{B}$, ${\text{BH}}^{+}$ and ${\text{BH}}_2^{2+}$ has to be determined.

Concept Introduction:

Ionic product of water is denoted by $K_{\text{w}}$ and is expressed as follows:

  $K_{\text{w}}=K_{\text{a}}{K}_{\text{b}}$

Here,

$K_{\text{a}}$ is acid equilibrium constant.

$K_{\text{b}}$ is base equilibrium constant.

$\text{pH}$ of solution is defined as the negative logarithm of concentration of ${\text{H}}^{+}$. It is expressed as follows:

  $\text{pH}=-\text{log}\left[{\text{H}}^{+}\right]$