Selective precipitation of ions in a mixture in the form of salts can be adding common ions
Channel: Doubtnut
Date: 2020-04-19

Selective precipitation of ions in a mixture in the form of salts can be adding common ions gradually. Let us condsider selective precipitation of `CI^(-)` and `CrO_(4)^(2-)`ions in the form of AgCl and `Ag_(2)Cro_(4)` form a mixture having having 0.01M `CI^(-)` and 0.01M `CrO_(4)^(2-)`. For this, salt having `Ag^(+)` [like `AgNO_(3)(s)`] is added gradually. Given : `K_(sp) [AgCI]=10^(-10)` and `K_(sp)[Ag_(2)CrO_(4)]=4xx10^(-14)`   Minimum concentration of `Ag^(+)` ion at which precipitation of at least one ion starts.