Chapter 18, Problem 70A

(a)

Interpretation Introduction

Interpretation: The expression of ${\text{K}}_{\text{sp}}$ for $\text{NiS}$ is to be given.

Concept Introduction: The expression representing the product of the concentrations of the ions each raised to the power (equal to their stoichiometric coefficient) in the dissociation equation is termed as solubility product constant $\left({\text{K}}_{\text{sp}}\right)$ .

Answer to Problem 70A

The expression of $\left({\text{K}}_{\text{sp}}\right)$ for $\text{NiS}$ is given as;

  ${\text{K}}_{\text{sp}}=\left[{\text{Ni}}^{2+}\right]\left[{\text{S}}^{2-}\right]$

Explanation of Solution

The chemical equation for the dissociation of nickel sulfide is represented as;

  $\text{NiS}\left(\text{s}\right)\rightleftharpoons {\text{Ni}}^{\text{2+}}\left(\text{aq}\right)+{\text{S}}^{2-}\left(\text{aq}\right)$

Therefore, the solubility product expression for $\text{NiS}$ is given as;

  ${\text{K}}_{\text{sp}}=\left[{\text{Ni}}^{2+}\right]\left[{\text{S}}^{2-}\right]$

(b)

Interpretation Introduction

Interpretation: The expression of ${\text{K}}_{\text{sp}}$ for ${\text{BaCO}}_3$ is to be given.

Concept Introduction: The expression representing the product of the concentrations of the ions each raised to the power (equal to their stoichiometric coefficient) in the dissociation equation is termed as solubility product constant $\left({\text{K}}_{\text{sp}}\right)$ .

Answer to Problem 70A

The expression of ${\text{K}}_{\text{sp}}$ for ${\text{BaCO}}_3$ is given as;

  ${\text{K}}_{\text{sp}}=\left[{\text{Ba}}^{2+}\right]\left[{\text{CO}}_3^{2-}\right]$

Explanation of Solution

The chemical equation for the dissociation of barium carbonate is represented as;

  ${\text{BaCO}}_3\left(\text{s}\right)\rightleftharpoons {\text{Ba}}^{\text{2+}}\left(\text{aq}\right)+{\text{CO}}_3^{2-}\left(\text{aq}\right)$

Therefore, the solubility product expression for ${\text{BaCO}}_3$ is given as;

  ${\text{K}}_{\text{sp}}=\left[{\text{Ba}}^{2+}\right]\left[{\text{CO}}_3^{2-}\right]$