Which base is present in milk of magnesia?
Magnesium hydroxide
Milk of magnesia is an aqueous suspension of magnesium hydroxide, \(\text{Mg(OH)}_2\). It is a mild base used as an antacid and laxative because it neutralises excess stomach acid:
\[\text{Mg(OH)}_2 + 2\text{HCl} \rightarrow \text{MgCl}_2 + 2\text{H}_2\text{O}\]
Sodium hydroxide is too corrosive for ingestion; ammonium and calcium hydroxide are not the active ingredient.
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