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  3. Chemistry
  4. The solubility of Fe ( OH )3 is x mol L -1. Its Ks p would be

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Q. The solubility of $Fe ( OH )_{3}$ is $x\, mol\, L ^{-1}$. Its $K_{s p}$ would be

J & K CETJ & K CET 2013Equilibrium

Solution:

Dissociation of $Fe ( OH )_{3}$ in solution is represented as follows
$\underset{(-x)}{ Fe ( OH )_{3}} \rightleftharpoons \underset{(x)}{ Fe^{3+}} + \underset{(3x)}{3OH^-} K_{sp} = x \times (3x)^3 =27 x^{4}$