How many grams of $C a C_{2} O_{4}$ will dissolve in distilled water to make one litre saturated solution? Solubility product of $C a C_{2} O_{4}$ is $2.5 \times 10^{- 9},$ and its molecular weight is $128$ .

0.0064

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0.0128

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0.0032

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0.0640

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Solution

The correct option is A $0.0064$ g
Let us consider the problem:
For $K_{S P} (C a C_{2} O_{4}) = S^{2}$

Since, $S = \sqrt{K_{S P}} = \sqrt{25 \times 10^{- 10}} = 5 \times 10^{- 5} M$

Given: Molecular weight $= 128$

Hence $W_{C a C_{2} O_{4}} = 5 \times 10^{- 5} \times 128 = 0.0064 g$ .

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