- A problem with the remedy given in problem 8 for acid indigestion is that the carbon dioxide produced can cause discomfort. In many mod-
ern antacids, the active ingredient is magnesium hydroxide, Mg(OH)2.
When this compound reacts with the hydrochloric acid, a double-dis-
placement reaction occurs that produces only water and magnesium
chloride, MgCl2. Write the balanced equation for this reaction.