Question

What is the solubility of $AI\left(OH{)}_3\right(K_{sp}=1\times {10}^{-33})$ in a buffer solution $pH=4$ ?

• A. ${10}^{-3}M$
• B. ${10}^{-6}M$
• C. $1\times {10}^{-4}M$
• D. $0.25\times 0^{-8}M$

Answer 1

The correct option is D $0.25\times 0^{-8}M$

$K_{sp}=\left({Al}^{3+}\right){\left({OH}^{-}\right)}^3{K}_{sp}=\left(s\right){\left(3s\right)}^3$

$={27s}^{4}s=\sqrt[4]{4\frac{1\times {10}^{-33}}{27}}$

$=0.25\times {10}^{-8}M$