Question

The solubility product of aluminium sulphate is given by the expression

• A. $4S^3$
• B. $6912S^7$
• C. $S^2$
• D. $108S^5$

Answer 1

Answer: (D)

$A{l}_2{\left(S{O}_4\right)}_3\rightleftharpoons \underset{2s}{2A{l}^{3+}}+\underset{3s}{3S{O}_4^{2-}}$

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