Chemistry - Ionic Equilibrium Question with Solution | TestHub

$\text{displaylines}PbC{l}_2(s)\to P{b}^{+2}\left(aq\right)+2C{l}^{-}\left(aq\right)$

s2s

${\mathrm{K}}_{\mathrm{sp}}=\mathrm{s}(2\mathrm{s}{)}^2=4{\mathrm{s}}^3$

$4\times 10^{-6}=4{\mathrm{s}}^3$

$\mathrm{s}=10^{-2}$ mole/litre $=\frac{{\mathrm{n}}_{{\mathrm{PbCl}}_2\text{ dissolve }}}{{\mathrm{V}}_{\text{solution (litre) }}}$

${\mathrm{V}}_{\text{solution (litre) }}=\frac{2.78}{278}\times \frac{1}{10^{-2}}$

${\mathrm{V}}_{\text{solution (litre) }}=1$ litre

${\mathrm{d}}_{\text{solution }}=1\mathrm{gm}/\mathrm{ml}$

Mass of final solution $=1000\mathrm{gm}$

Mass of water required $=1000-2.78$

${\mathrm{w}}_{\text{water added }}=997.22\mathrm{gm}$