Chapter 8.1, Problem 2RQ

Interpretation Introduction

Interpretation: The salts that are soluble in water should be selected.

Concept Introduction: There are general rules that are used to predict the solubility of ionic compounds in water at ${25}^o\text{ C}$ , based on which the solubility of ionic compounds in water can be predicted.

Answer to Problem 2RQ

The correct options are (b) sodium chloride and (c) potassium hydroxide.

Explanation of Solution

Reason for correct options:

According to solubility rules:

• Most of the chloride salts are soluble in water but there are exceptions of ${\text{AgCl, PbCl}}_2{\text{ and Hg}}_2{\text{Cl}}_2$ that are insoluble in water
• Most of the hydroxides are slightly soluble in water but there are exceptions of salts of Group I elements that are soluble in water. Elements of Group II are slightly soluble.
So, sodium chloride and potassium hydroxide (potassium is a group 1 element) are soluble in water.

Conclusion

Reason for incorrect options:

According to the solubility rule, most of the carbonates, sulfides and phosphates are insoluble in water. So, calcium sulfate and magnesium phosphate are insoluble in water.