How many grams of calcium oxalate should...

How many grams of calcium oxalate should be dissolved in water to make one litre of saturated solution? (`K_sp` of `CaC_2O_4` is `2.5 X 10^-9` and its molecular weight is 128 u)

A

0.0064 g

B

0.0128 g

C

0.0032 g

D

0.0640 g

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A

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