Chapter 12, Problem 12.33P

(a)

Interpretation Introduction

Interpretation:

Reason behind constant solubility of ${\text{CaSO}}_{\text{4}}$ over $\text{pH}$ range of 3 to 8.5 has to be given.

Concept Introduction:

Le-Chatelier’s principle suggests if any change in reaction condition occurs the equilibrium is favored in opposite direction so as to undo the effect. For instance, if concentration of products is increased then reaction tends to shift in direction of substrates.

(b)

Interpretation Introduction

Interpretation:

Effect of solubility of ${\text{CaSO}}_{\text{4}}$ at low and high $\text{pH}$ has to be given.

Concept Introduction:

Refer to part (a).