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100g of a water samples is found to cont...

100g of a water samples is found to contain 12 mg of `MgSO_(4)` calculate the hardness of water sample.

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`120 g` of `MgSO_(4) = 100 g` of `CaCO_(3)`
`rArr 12 xx 10^(-3) = ?`
`rArr W_(CaCO_(3)) = (12 xx 10^(-3)xx 100)/(120) = 10^(-2)g`
Hardness `= (W_(CaCO_(3))(g))/(W_(H_(2)O(g))) xx 10^(6) = (10^(-2))/(10^(2)) xx 10^(6) = 100 p p m`
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