#### Question

15000 litres of hard water was passed through a zeolite softener. The exhausted zeolite required 120 litres of NaCI having stream of 30g/l of NaCL Calculate the hardness of water.

#### Solution

1 litre of NgCl solution = 30 gm of NaCl.

∴ 120 litre of NaCl = 120x30x10^{3} mg of NaCl.

∴ 3600 x10^{3} mg of NaCl. = 3600 x10^{3 }x `50/58.5`

`= 30.7692 xx 10^5 "mg of " CaC0_3 ` equivalent.

15000 litres of water ` = 30.7692 xx10^5 " mg of" CaC0_3` equivalent.

∴ 1 litres of water = `(30.7692 xx10^5)/15000` = 205.1 ppm

∴ Hardness of water samQ.Ie = 205. 1 ppm

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#### APPEARS IN

Solution 15000 Litres of Hard Water Was Passed Through a Zeolite Softener. the Exhausted Zeolite Required 120 Litres of Naci Having Stream of 30g/L of Nacl Calculate the Hardness of Water. Concept: Hardness of Water.