The concentration of `Ni^(+2)` ions in a given `NiS` solution is `2.0 xx 10^(-6)M`. Find the minimum `S^(2-)` ions necessary to cause precipitation of `NiS. K_(sp)` of `NiS = 1.4 xx 10^(-14)`.

The complex ion [Ni(CN)_4]^(2-) is :

Calculate the concentration of SO_4^(2-) ions necessary to cause the precipitation of BaSO_4 (K_(sp)=1.5xx10^(-9)) from solution of BaCl_2 (0.5 M)

The solubility product (K_(sp)) of AgCI is 1.1 xx 10^(-10) and the concentration of Ag^(+) ions in given solution is 1.0 xx 10^(-7) mole per litre. The concentration CI^(-) for precipitation to occur will be