Chapter 18, Problem 3STP

Interpretation Introduction

Interpretation:

$pOH$ of the solution is to be found out using given concentration.

Concept introduction:

pH gives the concentration of hydrogen ion in a solution.

It tells about acidity and basicity of a solution.

It is given by:

$\begin{array}{l}pH=-\log \left[H^{+}\right]\\ pOH=-\log \left[O{H}^{-}\right]\\ pH+pOH=14\\ \left[H^{+}\right]isconcentationofhydrogenions\\ \left[O{H}^{-}\right]isconcentationofhydroxylions\end{array}$

Answer to Problem 3STP

A

Explanation of Solution

Given:

$\left[HBr\right]=0.0375M$

Therefore, $\left[H^{+}\right]=0.0375M$

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

Therefore,

$\begin{array}{c}pH=-\log 0.0375\\ =1.426\end{array}$

$\begin{array}{c}pOH=14-pH\\ =14-1.426\\ =12.574\end{array}$

Conclusion

$pOH=12.574$

So option A is correct.