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Uses of the Hydroxides

Milk of Magnesia

Milk of Magnesia is a saturated solution of magnesium hydroxide mixed with solid magnesium hydroxide. It acts as an antacid neutralising the HCl in the stomach to relieve the symptoms of indigestion. The low solubility of magnesium hydroxide means there is a low concentration of OH- ions which poses no risk to health.: Mg(OH)2 (s) + 2HCl (aq) → MgCl2 (aq) + 2H2O (l)

Group 2 Use in Agriculture

Farmers add lime to the soil to control the soil acidity as it neutralises excess acidity in the soil:Ca(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O (l)

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 4A: The elements of Groups 1 and 2. Topic: Group 2.

More in Group 2

All 16 lessons in Group 2 · All Edexcel AS-level Chemistry topics