Chapter 4, Problem 43E

(a)

Interpretation Introduction

Interpretation: The balanced molecular and net ionic equation for the reaction of magnesium carbonate, magnesium oxide and magnesium hydroxide with a hydrochloric acid solution.

Concept introduction:

The balanced chemical equation in which ionic compounds are expressed as molecules rather than ions is known as molecular equation.
In ionic equation, the reactants and products in a chemical equation are represented as their ions.
The net ionic equation for the given reactions is written after cancelling the spectator ions in each equation present on both the sides.

(b)

Interpretation Introduction

Interpretation:

The difference between the magnesium compounds from the other two on the basis of the reactions occurs in part (a).

Concept introduction: When magnesium carbonate reacts with hydrochloric acid:
   ${\text{MgCO}}_{\text{3}}\left(s\right)+2\text{HCl}\left(aq\right)\stackrel{}{\to }{\text{MgCl}}_{\text{2}}\left(aq\right)+{\text{H}}_{\text{2}}\text{O}\left(l\right)+{\text{CO}}_{\text{2}}\left(g\right)$

When magnesium oxide reacts with hydrochloric acid:
   $\text{MgO}\left(s\right)+2\text{HCl}\left(aq\right)\stackrel{}{\to }{\text{MgCl}}_{\text{2}}\left(aq\right)+{\text{H}}_{\text{2}}\text{O}\left(l\right)$

When magnesium hydroxide reacts with hydrochloric acid:
   $\text{Mg}{\left(\text{OH}\right)}_2\left(s\right)+2\text{HCl}\left(aq\right)\stackrel{}{\to }{\text{MgCl}}_{\text{2}}\left(aq\right)+2{\text{H}}_{\text{2}}\text{O}\left(l\right)$