Chapter 9, Problem 9.82QP

(a)

Interpretation Introduction

Interpretation:

The hydronium ion concentrations of the given solutions are should be determined by using given $\text{pH}$ values.

Concept introduction:

$\text{pH}$Scale:

• The equilibrium constant of water is,

${\text{K}}_{\text{w}}\text{=}{\text{[H}}_{\text{3}}{\text{O}}^{\text{+}}{\text{][OH}}^{\text{-}}\text{]=1}{\text{.0×10}}^{\text{-14}}$

$\begin{array}{l}\text{pKw}\text{=}\text{14}\\ \text{pKw}\text{=}\text{pH=pOH}\end{array}$

• From the above result the $\text{pH}\text{=below}\text{7 pOH}\text{=}\text{above}\text{7 in 7 is a neutral}$
• The solution having below7 $\text{pH}$ means it is acidic and it has more hydrogen ion concentration.
• The solution having above 7 $\text{pH}$ means it is basic and it has more hydroxide ion concentration.

(b)

Interpretation Introduction

Interpretation:

The hydronium ion concentrations of the given solutions are should be determined by using given $\text{pH}$ values.

Concept introduction:

$\text{pH}$Scale:

• The equilibrium constant of water is,

${\text{K}}_{\text{w}}\text{=}{\text{[H}}_{\text{3}}{\text{O}}^{\text{+}}{\text{][OH}}^{\text{-}}\text{]=1}{\text{.0×10}}^{\text{-14}}$

$\begin{array}{l}\text{pKw}\text{=}\text{14}\\ \text{pKw}\text{=}\text{pH=pOH}\end{array}$

• From the above result the $\text{pH}\text{=below}\text{7 pOH}\text{=}\text{above}\text{7 in 7 is a neutral}$
• The solution having below7 $\text{pH}$ means it is acidic and it has more hydrogen ion concentration.
• The solution having above 7 $\text{pH}$ means it is basic and it has more hydroxide ion concentration.

(c)

Interpretation Introduction

Interpretation:

The hydronium ion concentrations of the given solutions are should be determined by using given $\text{pH}$ values.

Concept introduction:

$\text{pH}$Scale:

• The equilibrium constant of water is,

${\text{K}}_{\text{w}}\text{=}{\text{[H}}_{\text{3}}{\text{O}}^{\text{+}}{\text{][OH}}^{\text{-}}\text{]=1}{\text{.0×10}}^{\text{-14}}$

$\begin{array}{l}\text{pKw}\text{=}\text{14}\\ \text{pKw}\text{=}\text{pH=pOH}\end{array}$

• From the above result the $\text{pH}\text{=below}\text{7 pOH}\text{=}\text{above}\text{7 in 7 is a neutral}$
• The solution having below7 $\text{pH}$ means it is acidic and it has more hydrogen ion concentration.
• The solution having above 7 $\text{pH}$ means it is basic and it has more hydroxide ion concentration.