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

1000 gr water →120 × 10–3 gr MgSO4106 gr water → x ; x = 120 ppmDegree of hardness = 120 / 120 x 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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Detailed Solution

1000 gr water $\to$ 120 × 10^–3 gr MgSO₄
10⁶ gr water $\to$ x ; x = 120 ppm
Degree of hardness = 120 / 120 x 100 = ppm

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