Chemical and Ionic Equilibrium 2 Question 19
19. For a sparingly soluble salt $A_{p} B_{q}$, the relationship of its solubility product $\left(L_{S}\right)$ with its solubility $(S)$ is
$(2001,1 \mathrm{M})$
(a) $L_{s}=S^{p+q} \cdot p^{p} \cdot q^{q}$
(b) $L_{s}=S^{p+q} \cdot p^{q} \cdot q^{p}$
(c) $L_{S}=S^{p q} \cdot p^{p} \cdot q^{q}$
(d) $L_{s}=S^{p q} \cdot(p \cdot q)^{(p+q)}$
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Solution:
- $A_{p} B_{q} \rightleftharpoons \underset{p S}{p A}+\underset{q S}{q B}$
$$ K_{\mathrm{sp}}=(p S)^{p}(q S)^{q}=S^{(p+q)} \cdot p^{p} \cdot q^{q} $$
