What is the hardness of a water sample ( in terms of equivalents of CaCO 3 ) containing 10 - 3 M CaSO 4 ? ( Molar mass of CaSO 4 = 136 g mol - 1 )

Question

What is the hardness of a water sample ( in terms of equivalents of CaCO 3 ) containing 10 - 3 M CaSO 4 ? ( Molar mass of CaSO 4 = 136 g mol - 1 ), 90 ppm, 50 ppm, 10 ppm, 100 ppm

MARKS App · Accepted Answer

As 1 L solution have 10 - 3 mol CaSO 4 Eq . of CaSO 4 = eq . of CaCO 3 In 1 L solution n CaSO 4 × v . f = n CaCO 3 × v . f . 10 - 3 × 2 = n CaCO 3 × 2 n CaCO 3 = 10 - 3 mol in 1 L ∴ W CaCO 3 = 100 × 10 - 3 g in 1 L solution ∴ hardness in terms of CaCO 3 = W CaCO 2 W total × 10 6 = 100 × 10 - 3 g 1000 g × 10 6 = 100 ppm

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