Calcium oxide from oyster shells is used to precipitate magnesium from sea water. The oxide reacts with water to form

Question

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Calcium oxide (CaO) reacts with water (H2O) to form calcium hydroxide (Ca(OH)2), which is a strong base. When added to sea water containing magnesium ions (Mg2+), the hydroxide ions (OH-) from calcium hydroxide react with the magnesium ions to form insoluble magnesium hydroxide (Mg(OH)2) which precipitates out of the solution.

Calcium Oxide from Oyster Shells Is Used to Precipitate Magnesium