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6-2.Equilibrium-II (Ionic Equilibrium)
medium
The volume of the water needed to dissolve $1\,g$ of $BaSO_4\, (K_{sp} = 1.1\times10^{-10})$ at $25\,^oC$ is .....$ litre$
A
$820$
B
$410$
C
$205$
D
None of these
Solution
Solubility of $\mathrm{BaSO}_{4}=\sqrt{\mathrm{K}_{\mathrm{SP}}}$
${=\sqrt{1.1 \times 10^{-10}}}$
${=1.05 \times 10^{-5}\, \mathrm{M}}$
$\therefore $ wt. of $\mathrm{BaSO}_{4}=1.05 \times 10^{-5} \times 233$
$=244.37 \times 10^{-5}\, \mathrm{g} / \mathrm{litre}$
$\therefore $ Volume of water needed to dissolve
$1\,g$ of $\mathrm{BaSO}_{4}=\frac{1}{244.37 \times 10^{-5}}$
$=410$ $litre$
Standard 11
Chemistry
