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A sample of hard water contains 0.005 mo...

A sample of hard water contains `0.005` mole of `CaCI_(2)` per litre. What is the minimum concentration of `Na_(2)SO_(4)` (in mole/L) which must be exceeded for removing `Ca^(+)` ions from this water sample ? The solubility product of `CaSO_(4)` at `25^(@)C` is `2.4 xx 10^(-5)`. (Given your answer after multiplying with 10000 and excluding and decimal places)

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The correct Answer is:
`0048`
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