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Shezan Khan Grade: 11

How we prepare alkaline earth metal hydroxides?

8 years ago

Answers : (1)

askIITIians Expert
21 Points


Magnesium Hydroxide Mg(OH)2

It is precipitated when excess caustic alkali solution is added to a solution of a magnesium salt.

    MgCI2 + 2NaOH → Mg(OH)2 + 2NaCI

On heating it loses water yielding the oxide:

    Mg(OH)2→ MgO + H2O

It is a white solid, only slightly soluble in water giving an alkaline solution. Magnesium hydroxide dissolves in ammonium chloride solution forming a complex ion, which partly explains why it is not precipitated with the hydroxides of aluminium, chromium and iron in the qualitative analysis of group – III cations. It dissolves in acids like HCI and suspension of this in water is called milk of Magnesia and is used as an antacid.

8 years ago
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