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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Which of the substances in Exercises 27 and 28 show increased solubility as the pH of the solution becomes more acidic? Write equations for the reactions that occur to increase the solubility.

Interpretation Introduction

Interpretation: The substance that shows increased solubility as the pH of the solution becomes more acidic is to be identified from the exercise 27 and 28 . The equations for the chemical reactions that occur to increase the solubility are to be stated.

Concept introduction: The solubility of salt is affected by pH . The decrease in the value of pH has the opposite effect that is based on the application of Le Chatlier’s principle. The anions of strong acid and their salt is independent of pH value whereas anions of weak acid is affected by pH value. If the pH value of basic salt is decreased, its solubility will increase.

Explanation

Explanation

To identify: The substance that shows increased solubility as the pH of the solution becomes more acidic from the exercise 27 and 28 ; the equations for the chemical reactions that occur to increase the solubility are to be stated.

The compound Ag3PO4 and CaCO3 will show increased solubility as the pH of the solution becomes more acidic.

The pH value can be decreased when H3O+ ion is added into the basic solution. The added H3O+ ion will react with OH to form water. The reaction of OH with water leads to its removal from the solution. According to Le Chatlier’s principle, the equilibrium shift to right to compensate the loss of OH ion. This leads to increase in the solubility of basic salt.

The compounds in exercise 27 are,

Ag3PO4,CaCO3 and Hg2Cl2

The anion Cl is an ion of strong acid and their salt is independent of pH value. Hence, the solubility of Hg2Cl2 is independent of pH value.

The compound Ag3PO4 and CaCO3 are basic salt. Hence, their solubility will increase when solution becomes more acidic.

The required reactions are,

Ag3PO4+3H+3Ag++H3PO4

CaCO3+2H+Ca2++H2CO3Ca2++CO2+H2O

The equations for the chemical reactions of Ag3PO4 and CaCO3 that occur to increase the solubility are,

Ag3PO4+3H+3Ag++H3PO4

CaCO3+2H+Ca2++H2CO3Ca2++CO2+H2O

The compound Sr3(PO4)2 and CdCO3 will show increased solubility as the pH of the solution becomes more acidic

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