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How we prepare alkaline earth metal hydroxides? How we prepare alkaline earth metal hydroxides?
How we prepare alkaline earth metal hydroxides?
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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