Chapter 1, Problem 24P

Interpretation Introduction

Interpretation:

The quantity of ${\text{NaH}}_2{\text{PO}}_4$ and ${\text{Na}}_2{\text{HPO}}_4$ (in grams) is to be determined.

Concept introduction:

Henderson and Haselbalch equation is used to find the concentrations. The expression is as given below,

$\text{pH}=\text{p}{K}_{\text{a}}+\log \frac{\left[{\text{Na}}_2{\text{HPO}}_4\right]}{\left[{\text{NaH}}_2{\text{PO}}_4\right]}$ ....... (1)

Where,

• $\text{p}{K}_{\text{a}}$ is the dissociation constant.
• $\left[{\text{Na}}_2{\text{HPO}}_4\right]$ is the concentration of ${\text{Na}}_2{\text{HPO}}_4$ .
• $\left[{\text{NaH}}_2{\text{PO}}_4\right]$ is the concentration of ${\text{NaH}}_2{\text{PO}}_4$ .