Chapter 10, Problem 10.83EP

(a)

Interpretation Introduction

Interpretation:

Whether a sample of milk with pH 6.4 is acidic, basic or neutral has to be given.

Concept Introduction:

pH definition:

The concentration of hydrogen ion is measured using pH scale.  The acidity of aqueous solution is expressed by pH scale.

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

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

Based on the pH value, a solution can be classified as acidic, basic or neutral solution.

  $\begin{array}{l}\text{pH < 7, acidic solution}\\ \text{pH > 7, basic solution}\\ \text{pH = 7, neutral solution}\end{array}$

(b)

Interpretation Introduction

Interpretation:

Whether a sample of seawater with pH 8.5 is acidic, basic or neutral has to be given.

Concept Introduction:

pH definition:

The concentration of hydrogen ion is measured using pH scale.  The acidity of aqueous solution is expressed by pH scale.

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

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

Based on the pH value, a solution can be classified as acidic, basic or neutral solution.

  $\begin{array}{l}\text{pH < 7, acidic solution}\\ \text{pH > 7, basic solution}\\ \text{pH = 7, neutral solution}\end{array}$

(c)

Interpretation Introduction

Interpretation:

Whether a sample of drinking water with pH 7.2 is acidic, basic or neutral has to be given.

Concept Introduction:

pH definition:

The concentration of hydrogen ion is measured using pH scale.  The acidity of aqueous solution is expressed by pH scale.

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

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

Based on the pH value, a solution can be classified as acidic, basic or neutral solution.

  $\begin{array}{l}\text{pH < 7, acidic solution}\\ \text{pH > 7, basic solution}\\ \text{pH = 7, neutral solution}\end{array}$

(d)

Interpretation Introduction

Interpretation:

Whether a sample of strawberry with pH 3.4 is acidic, basic or neutral has to be given.

Concept Introduction:

pH definition:

The concentration of hydrogen ion is measured using pH scale.  The acidity of aqueous solution is expressed by pH scale.

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

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

Based on the pH value, a solution can be classified as acidic, basic or neutral solution.

  $\begin{array}{l}\text{pH < 7, acidic solution}\\ \text{pH > 7, basic solution}\\ \text{pH = 7, neutral solution}\end{array}$