A sample of hard water contasins 0.005 m...

A sample of hard water contasins `0.005` mole of `CaCI_(2)` per liter. What is the minimum concentration of `Na_(2)SO_(4)` which must be added for removing `Ca^(2+)` ions from this water sample ? `(K_(SP)for CaSO_(4)=2.4xx10^(-5) at 25^(@)C)`

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0.0048 mole/L

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