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Give reasons for the following : (i) Magnesium is not precipitated from a solution of its salt by NH_(4)OH in the presence of NH_(4)Cl. (ii) Ammonium chloride is acidic in liquid ammonia solvent |
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Answer» Solution :(i) The solubility PRODUCT of `Mg(OH)_(2)` is high. Presence of `NH_(4)Cl` suppresses the DISSOCIATION of `NH_(4)OH` due to common ion EFFECT thus giving low giving low concentration of `[OH^(-)]` . The IONIC product, therefore, cannotexceed the solubility product. (ii) In solution of `NH_(4)Cl` in liquid `NH_(3)`, the following reaction takes place : `NH_(4)^(+) + NH_(3) hArr NH_(3)+NH_(4)^(+)` Thus, `NH_(4)Cl` gives proton. Hence, it is acidic. |
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