Chapter 16, Problem 19E

Interpretation Introduction

Interpretation:

The mass of sodium benzoate that is added to the given volume of solution of $0.15\text{M}$ benzoic acid, in order to have pH $4.25$ is to be calculated.

Concept introduction: Molarity of the solute in the solution is defined as the ratio of moles of the solute in the solution to the volume of solution.

Henderson-Hasselbalch equation provides an expression by which the pH of a buffer solution can be calculated.

To determine: The mass of sodium benzoate that is added to a $150\text{ml}$ volume of solution of $0.15\text{M}$ benzoic acid, in order to have pH $4.25$ of the buffer.