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  4. The solubility product of aluminium sulphate is given by the expression

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Q. The solubility product of aluminium sulphate is given by the expression

Equilibrium

Solution:

$ Al _{2}\left( SO _{4}\right)_{3} \rightleftharpoons \underset{2s}{ 2 Al ^{3+}}+\underset{3s}{3SO^{2-}_{4}}$

$K_{s p}=(2 s)^{2}(3 s)^{3}=4 \times 27 s^{5}=108 \,s^{5}$