Chapter 16.2, Problem 2RQ

(a)

Interpretation Introduction

Interpretation: The $pH$ of the solution needs to be calculated.

Concept introduction: $pH$ is a measure of the acidity or alkalinity of a solution. The pH scale generally varies from 0 to 14.

The equation for $pH$ is given by,

  $pH=-\text{log[}{H}^{+}]$ where, $\text{[}{H}^{+}]=\text{ concentration of hydrogen ion}\text{.}$

Answer to Problem 2RQ

  $pH$ of the solution is 4.50

Explanation of Solution

Here the concentration of $H^{+}=3.14\times {10}^{-5}\text{ M}$

  $\begin{array}{c}pH=-\text{log[}3.14\times {10}^{-5}]\\ =4.50\end{array}$

(b)

Interpretation Introduction

Interpretation: The $pH$ of the solution needs to be calculated.

Concept introduction: $pH$ is a measure of the acidity or alkalinity of a solution. The pH scale generally varies from 0 to 14.

The equation for $pH$ is given by,

  $pH=-\text{log[}{H}^{+}]$ where, $\text{[}{H}^{+}]=\text{ concentration of hydrogen ion}\text{.}$

Answer to Problem 2RQ

  $pH$ of the solution is 8.16

Explanation of Solution

Here the concentration of $H^{+}=6.92\times {10}^{-9}\text{ M}$

  $\begin{array}{c}pH=-\text{log[6}\text{.92}\times {10}^{-9}]\\ =8.16\end{array}$