   Chapter 16.4, Problem 16.2CYU

Chapter
Section
Textbook Problem

For each of the following salts in water, predict whether the pH will be greater than, less than, or equal to 7.(a) KBr(b) NH3NO3(c) AlCl3(d) Na2HPO4

(a)

Interpretation Introduction

Interpretation:

Whether the pH will be greater than, less than or equal to 7 for the following salts has to be identified.

Concept Introduction:

The pH is a unit of measure which describe the degree of alkanity or acidity of a solution.

pH = log[H+]

A solution may be acidic and basic depends on relative strength of anions as an acid or base. Anions and cations can be acidic, basic and netural. Acidic have pH < 7, basic have pH > 7 and netural have pH=7.

Explanation

Refer to table 16.3 in textbook for the acidic and basic nature of ions.

In given salt KBr, K+ is cation and Br is anion with neutral nature .

K++H2OKOH+H+Br

(b)

Interpretation Introduction

Interpretation:

Whether the pH will be greater than, less than or equal to 7 for the following salts has to be identified.

Concept Introduction:

The pH is a unit of measure which describe the degree of alkanity or acidity of a solution.

pH = log[H+]

A solution may be acidic and basic depends on relative strength of anions as an acid or base. Anions and cations can be acidic, basic and netural. Acidic have pH < 7, basic have pH > 7 and netural have pH=7.

(c)

Interpretation Introduction

Interpretation:

Whether the pH will be greater than, less than or equal to 7 for the following salts has to be identified.

Concept Introduction:

The pH is a unit of measure which describe the degree of alkanity or acidity of a solution.

pH = log[H+]

A solution may be acidic and basic depends on relative strength of anions as an acid or base. Anions and cations can be acidic, basic and netural. Acidic have pH < 7, basic have pH > 7 and netural have pH=7.

(d)

Interpretation Introduction

Interpretation:

Whether the pH will be greater than, less than or equal to 7 for the following salts has to be identified.

Concept Introduction:

The pH is a unit of measure which describe the degree of alkanity or acidity of a solution.

pH = log[H+]

A solution may be acidic and basic depends on relative strength of anions as an acid or base. Anions and cations can be acidic, basic and netural. Acidic have pH < 7, basic have pH > 7 and netural have pH=7.

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