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what happens in the precipitation of magnesium hydroxide?

Posted by Dgf Chd 4 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 4 years, 1 month ago

When a solution of magnesium salts is combined with alkaline water it instigates precipitation of solid magnesium hydroxide. The reaction is as follows:

Mg²⁺ + 2 OH⁻ → Mg(OH)₂

Commercially it is produced by treating lime and seawater. Approximately one ton of magnesium hydroxide is obtained from 600 m³ of seawater. Calcium hydroxide is more soluble in magnesium hydroxide therefore Mg(OH)₂ precipitates as a solid. The reaction is as follows:

MgO + H2O → Mg(OH)₂

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