Chapter 13, Problem 13.49FU

Interpretation Introduction

(a)

Interpretation:

To write equation for the dissociation of the slightly soluble ionic calcium carbonate.

Concept introduction:

Chemical formula of calcium carbonate = CaCO₃.

Answer to Problem 13.49FU

Equation for the dissociation of CaCO₃:

  $CaC{O}_3\text{(s)}\stackrel{K_{sp}}{\rightleftarrows }C{a}^{\text{+2}}\text{(aq)}\text{+}C{O}_3{}^{\text{-2}}\text{(aq)}$

Explanation of Solution

For the dissociation of slightly soluble compounds, there exists equilibrium between dissolved and undissolved compound.

Dissociation of CaCO₃:

  $CaC{O}_3\text{(s)}\stackrel{K_{sp}}{\rightleftarrows }C{a}^{\text{+2}}\text{(aq)}\text{+}C{O}_3{}^{\text{-2}}\text{(aq)}$

Calcium carbonate dissociate into calcium and carbonate ions.

Interpretation Introduction

(b)

Interpretation:

To write solubility product expression of the slightly soluble ionic calcium carbonate.

Concept introduction:

Solubility product may be defined as the product of concentration of products each raised to the power equals to their respective stoichiometric coefficient.

Answer to Problem 13.49FU

Solubility product expression of calcium carbonate is:

  ${\text{K}}_{\text{sp}}\text{=}{\text{[Ca}}^{\text{+2}}{\text{][CO}}_{\text{3}}{}^{\text{-2}}\text{]}$

Explanation of Solution

Equation for the dissociation of CaCO₃:

  $CaC{O}_3\text{(s)}\stackrel{K_{sp}}{\rightleftarrows }C{a}^{\text{+2}}\text{(aq)}\text{+}C{O}_3{}^{\text{-2}}\text{(aq)}$

Definition of solubility product: Solubility product may be defined as the product of concentration of products each raised to the power equals to their respective stoichiometric coefficient.

As per the definition, writing solubility product constant expression is:

  $\begin{array}{l}{\text{CaCO}}_{\text{3}}\text{(s)}\stackrel{{\text{K}}_{\text{sp}}}{\rightleftarrows }{\text{Ca}}^{\text{+2}}\text{(aq)}\text{+}{\text{CO}}_{\text{3}}{}^{\text{-2}}\text{(aq)}\\ \\ {\text{K}}_{\text{sp}}\text{=}{\text{[Ca}}^{\text{+2}}{\text{][CO}}_{\text{3}}{}^{\text{-2}}\text{]}\end{array}$