Chapter U4.18, Problem 5E

(a)

Interpretation Introduction

Interpretation:

If a particle view of HBr is drawn with 10 H+ ions then the number of Br- will be required must be explained.

Concept Introduction :

HBr is an acid which undergoes dissociation to produce one H+ and one Br^-.

Answer to Problem 5E

10 Br- will be required.

Explanation of Solution

The dissociation of HBr can be shown as

  $\text{HBr}\to {\text{H}}^{\text{+}}{\text{+Br}}^{\text{-}}$

Thus, it is clear than the number of H+ andBr- is same. So for 10 H+ ions 10 Br- ions will be required.

(b)

Interpretation Introduction

Interpretation:

A particle view of HBr must be drawn with 10 H+ ions.

Concept Introduction :

Number of H+ and Br- will be same as 1 HBr produces 1 H+ and 1 Br^-.

Answer to Problem 5E

A sketch is shown below for HBr with 10 H+ ions.

Here, red dots represent H+ and black dots represent Br^-.

Complete dissociation of HBr takes place because it is a strong acid.

Explanation of Solution

From the sketch it is clear that number of H+ and Br- ions is same. For 10 red dots (H⁺) there are 10 black dots (Br^-).