Chapter 9.3, Problem 41PP

Interpretation Introduction

Interpretation:

The chemical, complete ionic and net ionic equation of reaction of hydrochloric acid and aqueous calcium hydroxide to produce water and aqueous calcium chloride needs to be determined.

Concept introduction:

Chemical equation is the balanced chemical equation which shows the reactants and products using their chemical formulas. An ionic equation represents all the particles in a solution according to their existence and net ionic equations are the ionic equations that include only the particles participating in the reaction.

Answer to Problem 41PP

Chemical equation is,

$\text{2HCl}\text{(}aq\text{)}\text{+}{\text{Ca(OH)}}_2(aq)\to 2{\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}{\text{+CaCl}}_2$

Complete ionic equation is,

${\text{2H}}^{+}\text{(}aq\text{)}\text{+}{\text{2Cl}}^{-}\text{(}aq\text{)}\text{+}{\text{Ca}}^{2+}\text{(}aq\text{)}\text{+}2{\text{OH}}^{-}(aq)\to 2{\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}{\text{+Ca}}^{2+}\text{(}aq\text{)}\text{+}{\text{2Cl}}^{-}(aq)$

Net ionic equation is,

${\text{H}}^{+}\text{(}aq\text{)}\text{+}{\text{OH}}^{-}(aq)\to {\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}$

Explanation of Solution

Chemical equation shows the reactants and products using chemical formulas. So, reaction of hydrochloric acid and aqueous calcium hydroxide to produce water and aqueous calcium chloride is,

$\text{2HCl}\text{(}aq\text{)}\text{+}{\text{Ca(OH)}}_2(aq)\to 2{\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}{\text{+CaCl}}_2\left(aq\right)$

The complete ionic equation shows ions of reactants and products. So, the complete ionic equation is,

${\text{2H}}^{+}\text{(}aq\text{)}\text{+}{\text{2Cl}}^{-}\text{(}aq\text{)}\text{+}{\text{Ca}}^{2+}\text{(}aq\text{)}\text{+}2{\text{OH}}^{-}(aq)\to 2{\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}{\text{+Ca}}^{2+}\text{(}aq\text{)}\text{+}{\text{2Cl}}^{-}(aq)$

In net ionic equation, the common ions in both sides of the reaction are cancelled. So, the net ionic equation is,

$\begin{array}{l}{\text{2H}}^{+}\text{(}aq\text{)}\text{+}\cancel{{\text{2Cl}}^{-}\text{(}aq\text{)}}\text{+}\cancel{{\text{Ca}}^{2+}\text{(}aq\text{)}}\text{+}2{\text{OH}}^{-}(aq)\to 2{\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}\text{+}\cancel{{\text{Ca}}^{2+}\text{(}aq\text{)}}\text{+}{\text{2Cl}}^{-}(aq)\\ {\text{2H}}^{+}\text{(}aq\text{)}\text{+}2{\text{OH}}^{-}(aq)\to 2{\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}\\ {\text{H}}^{+}\text{(}aq\text{)}\text{+}{\text{OH}}^{-}(aq)\to {\text{H}}_{\text{2}}\text{O}\text{(}l\text{)}\end{array}$

Conclusion

To show the details of reactions that involves ions in aqueous solutions, the ionic equations, such as, complete ionic equation and net ionic equations are used.