Question

The hardness of 50,000 litres of a sample of water was removed by passing it through a zeolite softener. The softener then required 200 Iitres of sodium chloride solution containing 150g/litre of NaCI for regeneration. Calculate the hardness of sample of water

Answer 1

Answer:

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Answer 2

Given:

50000litres of a sample of water

200 litres of NaCl solution (150g/lit) for regeneration

To find :

Hardness of sample of water

Explanation:

Amount of NaCl required for purification = $200\times 150 = 30000 gms$

1gm equivalent of NaCl = 1 gm equivalent of $CaCO_3$ ( zeolite softener)

58.5gm of NaCl = 50 gm of $CaCO_3$

30000gm of NaCl = ? of  $CaCO_3$

Amount of NaCl in $CaCO_3$ equivalents = 25641 gm equivalent = 2.5641mg

50000 litres of water contains 2.5641 mg of hardness

1 litre of water contains 512.8 mg/litre

Therefore hardness of water = 512.8 ppm (ANS)