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The hardness of 75,000 litres of a water sample was completely removed by a permutit.

The exhausted permutit then required 1500L of NaCl containing 117mg of NaCl per litre for regeneration. Calculate the hardness of water sample.

FE > Semester 1 > Applied Chemistry 1

Marks : 04

Years : DEC 2015

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117mg of NaCL=1Litre

1500 liters solution contains =1500x117=175500mg of NaCL

Now,

CaCO3 equivalent =175500×1002×58.5=15×104mg of CaCO3/ppm

75×103 litrex

x=15×75×107 =1125×107

Hardness of water sample …

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