- Home
- Standard 11
- Chemistry
Solubility product constant ( $\mathrm{K}_{\mathrm{sp}}$ ) of salts of types $\mathrm{MX}, \mathrm{MX}_2$ and $\mathrm{M}_3 \mathrm{X}$ at temperature ' $\mathrm{T}$ ' are $4.0 \times 10^{-8}, 3.2 \times 10^{-14}$ and $2.7 \times 10^{-15}$, respectively. Solubilities (mole dm ${ }^{-3}$ ) of the salts at temperature ' $\mathrm{T}$ ' are in the order
$\mathrm{MX}>\mathrm{MX}_2>\mathrm{M}_3 \mathrm{X}$
$\mathrm{M}_3 \mathrm{X}>\mathrm{MX}_2>\mathrm{MX}$
$\mathrm{MX}_2>\mathrm{M}_3 \mathrm{X}>\mathrm{MX}$
$\mathrm{MX}>\mathrm{M}_3 \mathrm{X}>\mathrm{MX}_2$
Solution
Solubility of $(M X)=\sqrt{4 \times 10^{-8}}=2 \times 10^{-4}$
Solubility of $\left(\mathrm{MX}_2\right)=8 \times 10^{-5}$
Solubility of $\left(\mathrm{M}_3 \mathrm{X}\right)=1 \times 10^{-4}$
$\therefore \mathrm{MX}>\mathrm{M}_3 \mathrm{X}>\mathrm{MX}_2$
