Chapter 21, Problem 21.30P

(a)

Interpretation Introduction

Interpretation:

$\text{pH}$ of the resulting solution has to be calculated when $\text{20mL of 0}{\text{.20M HCl}}_{\left(\text{aq}\right)}$ is added to $\text{40mL of 0}{\text{.10 M NaOH}}_{\left(\text{aq}\right)}.$

Concept Introduction:

$\text{pH}$ definition:

The concentration of hydrogen ion is measured using $\text{pH}$ scale.  The acidity of aqueous solution is expressed by pH scale.

The $\text{pH}$ of a solution is defined as the negative base-10 logarithm of the hydrogen or hydronium ion concentration.

    $\text{pH}\text{=}{\text{-log[H}}_{\text{3}}{\text{O}}^{\text{+}}\text{]}$

 (b)

Interpretation Introduction

Interpretation:

$\text{pH}$ of the resulting solution has to be calculated when $\text{20mL of 0}{\text{.20M HCl}}_{\left(\text{aq}\right)}$ is added to $\text{20mL of 0}{\text{.15 M NaOH}}_{\left(\text{aq}\right)}.$

Concept Introduction:

Refer part (a).