Chemistry - Ionic Equilibrium Question with Solution | TestHub

Precipitation occurs, if${\mathrm{Q}}_{\mathrm{c}}>{\mathrm{K}}_{\mathrm{s}\mathrm{p}}$. The maximum concentration of$\mathrm{B}\mathrm{a}{\left(\mathrm{N}{\mathrm{O}}_3\right)}_3$or$\mathrm{Ba}{2+}^{}$without precipitation is obtained if
${\mathrm{Q}}_{\mathrm{c}}={\mathrm{K}}_{\mathrm{s}\mathrm{p}}=\left[\mathrm{B}{\mathrm{a}}^{2+}\right]\left[\mathrm{C}\mathrm{r}{\mathrm{O}}_4^{2-}\right]$
$2.4\times 10^{-10}{\mathrm{M}}^2=\left[{\mathrm{Ba}}^{2+}\right]\left(6\times 10^{-4}\mathrm{M}\right)$
or$\left[\mathrm{B}{\mathrm{a}}^{2+}\right]=\frac{2.4\times 10^{-10}{\mathrm{M}}^2}{6\times 10^{-4}\mathrm{M}}$
$=0.4\times 10^{-6}\mathrm{M}$
$=4\times 10^{-7}\mathrm{M}$.