The hardness of water sample containing 10-3M MgSO4 expressed as CaCO3 equivalents (in ppm) is ____

1000 grams of water →120×10-3 grams MgSO4106 grams water → x X=120 ppm.Degree of hardness=120120×100=100 ppm

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The hardness of water sample containing 10^-3M MgSO₄ expressed as CaCO₃ equivalents (in ppm) is ____

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1000 grams of water →120×10^-3 grams MgSO₄
106 grams water → x
X=120 ppm.
Degree of hardness $= \frac{120}{120} \times 100 = 100 ppm$

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