   Chapter 17, Problem 63PS

Chapter
Section
Textbook Problem

Which insoluble compound in each pair should be more soluble in nitric acid than in pure water? (a) PbCl2 or PbS (b) Ag2CO3 or AgI (c) Al(OH)3 or AgCl

(a)

Interpretation Introduction

Interpretation:

In given each pair the salt will be more soluble in nitric acid than in pure water has to be predicted.

Concept introduction: The solubility of insoluble salts containing anions (conjugate base of a weak acid) such as hydroxide, acetate, carbonate, phosphate and sulfide increases in the presence of strong acid than in pure water. Whereas the solubility of insoluble salts containing anions (conjugate base of a strong acid) such as chlorides decreases in the presence of strong acid than in the pure water.

Explanation

PbS Dissociates in water as,

PbS(s)Pb2+(aq)+S2(aq)                                                                       (1)

Sulfide ion is a strong conjugate base of a weak acid (H2S). Reaction of S2 with strong nitric acid decreases the concentration of the sulfide ions in the solution and as a result, the reaction equilibrium in equation (1) shifts to right-hand side increasing the solubility of PbS.

S2(aq)+HNO3(aq)HS(aq)+NO3(aq)

(b)

Interpretation Introduction

Interpretation:

In given each pair the salt will be more soluble in nitric acid than in pure water has to be predicted.

Concept introduction: The solubility of insoluble salts containing anions (conjugate base of a weak acid) such as hydroxide, acetate, carbonate, phosphate and sulfide increases in the presence of strong acid than in pure water. Whereas the solubility of insoluble salts containing anions (conjugate base of a strong acid) such as chlorides decreases in the presence of strong acid than in the pure water.

(c)

Interpretation Introduction

Interpretation:

In given each pair the salt will be more soluble in nitric acid than in pure water has to be predicted.

Concept introduction: The solubility of insoluble salts containing anions (conjugate base of a weak acid) such as hydroxide, acetate, carbonate, phosphate and sulfide increases in the presence of strong acid than in pure water. Whereas the solubility of insoluble salts containing anions (conjugate base of a strong acid) such as chlorides decreases in the presence of strong acid than in the pure water.

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