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What is the degree of hardness of a wate...

What is the degree of hardness of a water sample containing `5xx10^(-3) g"/"L` of `CaCO_(3)`?

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Hardness (in ppm of `CaCO_(3) ) =(5.0 xx 10 ^(-3))/(100) xx 10 ^(6) = 5 `ppm
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