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  4. How many gram of CaC2O4 will dissolve in distilled water to make one litre of saturated solution ? (Ksp = 2.5 × 10-9 and its molecular mass is 128)

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Q. How many gram of $CaC_2O_4$ will dissolve in distilled water to make one litre of saturated solution ? $(K_{sp} = 2.5 \times 10^{-9}$ and its molecular mass is $128$)

Equilibrium

Solution:

$CaC_{2}O_{4} \rightleftharpoons Ca^{2+}+C_{2}O^{2-}_{4}$
$K_{sp}=[Ca^{+2}] [C_{2}O^{-2}_{4}]$
$K_{sp}=s^{2}$
$s=\sqrt{K_{sp}}=\sqrt{2.5\times 10^{-9}}$
$=5\times 10^{-5}\,mol\,L^{-1}$
Solubility of $g\, L^{-1}=5\times10^{-5}\times $ mol. wt.
$=5 \times 10^{-5} \times 128$
$=0.00640\,g\,L^{-1}$