Chapter 24, Problem 7STP

Interpretation Introduction

Interpretation:

The concentration of the KOH solution in the titration is to be determined.

Concept introduction:

The molarity of a solution containing a fixed amount of solute is inversely proportional to its volume. This is known as dilution principle.

Answer to Problem 7STP

Option C. 0.332M is the correct option.

Explanation of Solution

The molarity of KOH can be calculated suing the dilution principle.

$\begin{array}{l}{\text{The molarity of HCl solution M}}_{\text{1}}\text{=0}\text{.6M}\hfill \\ {\text{Its volume V}}_{\text{1}}\text{=15mL}\hfill \\ {\text{The molarity of KOH solution M}}_{\text{2}}\text{=?}\hfill \\ {\text{Its volume V}}_{\text{2}}\text{=27}\text{.13mL}\hfill \\ \text{According to dilution principle,}\hfill \\ \begin{array}{l}{\text{M}}_{\text{1}}{\text{V}}_{\text{1}}{\text{=M}}_{\text{2}}{\text{V}}_{\text{2}}\\ \text{0}{\text{.6×15=M}}_{\text{2}}\text{×27}\text{.13}\\ {\text{M}}_{\text{2}}\text{=}\frac{\text{0}\text{.6×15}}{\text{27}\text{.13}}\\ {\text{M}}_{\text{2}}\text{=0}\text{.332M}\end{array}\hfill \end{array}$