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A sample of water contained 30 PPM of Mg...

A sample of water contained 30 PPM of `MgSO_(4)` its hardness is x+20PPM What is 'x'

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30 ppm of `MgSO_(4) to 30` gm in `10^(6)` gm of `H_(2)O`, Hardness in term of `CaCO_(3) to 30xx(100)/(120)=25 `ppm
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