How we prepare alkaline earth metal hydroxides?
Shezan Khan , 15 Years ago
Grade 11
Inorganic Chemistry> How we prepare alkaline earth metal hydro...
1 Answers
askIITIians Expert
Last Activity: 15 Years ago
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.
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