Chapter 7, Problem 19A

Interpretation Introduction

Interpretation:

The unbalanced chemical equation corresponding to the reaction between magnesium hydroxide and hydrochloric acid needs to be presented.

Concept Introduction:

• A chemical reaction is expressed as a chemical equation having reactants and products on left and right side of the reaction arrow respectively.

  $\text{Reactants }\to \text{ Products}$

• It also gives the physical state (solid (s), liquid (l), gas (g)) and the amount of reactants and products involved in the reaction.

Answer to Problem 19A

  ${\text{Mg(OH)}}_{\text{2}}\text{(s) + HCl(l) }\to {\text{ MgCl}}_2{\text{ (aq) + H}}_{\text{2}}\text{O(l)}$

Explanation of Solution

The given process involves the reaction between solid magnesium hydroxide and hydrochloric acid to form an aqueous solution of magnesium hydroxide and water. The reactants and products are:

Reactants:

  $\begin{array}{l}{\text{Magnesium hydroxide, solid - Mg(OH)}}_2(\text{s})\\ \text{Hydrochloric acid, liquid - HCl(l)}\end{array}$

Products:

  $\begin{array}{l}{\text{Magnesium chloride, aqueous - MgCl}}_2\text{(aq)}\\ {\text{Water, liquid - H}}_{\text{2}}\text{O (l)}\end{array}$

Unbalanced equation:

  ${\text{Mg(OH)}}_{\text{2}}\text{(s) + HCl(l) }\to {\text{ MgCl}}_2{\text{ (aq) + H}}_{\text{2}}\text{O(l)}$

Conclusion

Therefore, the unbalanced reaction will have solid magnesium hydroxide and hydrochloric acid as the reactants with aqueous solution of magnesium hydroxide and wateras the products.