Chemical and Ionic Equilibrium - Result Question 10
####10. Which of the following salts is the most basic in aqueous solution?
(2018 Main)
(a) $Al(CN) _3$
(b) $CH _3 COOK$
(c) $FeCl _3$
(d) $Pb\left(CH _3 COO\right) _2$
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Solution:
- (i) $A _2(g)+B _2(g) \rightleftharpoons 2 A B(g)$;
$$ K _1=\frac{[A B]^{2}}{\left[A _2\right]\left[B _2\right]} $$
(ii) $6 A B(g) \rightleftharpoons 3 A _2(g)+3 B _2(g)$;
$$ \begin{aligned} K _2 & =\frac{\left[A _2\right]^{3}\left[B _2\right]^{3}}{[A B]^{-}}=\frac{1}{\left(\frac{[A B]^{2}}{\left[A _2\right]\left[B _2\right]}\right)^{3}}=\frac{1}{K _1^{3}}, \ K _2 & =K _1^{-3} \end{aligned} $$
