A zeolite softener was 90% exhausted by removing hardness of 10,000 l of hard water sample. The exhausted zeolite bed required 200 l of 3% nacl solution for its complete regeneration. Calculate hardness.
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The hardness of water is 0.5128 ppm
Explanation :
The Nacl concentration is 3%
=> 100 ltrs of the solution contains 3 grms of Nacl
=> 200 ltrs of solution contains 6 gms of Nacl
CaCO₃ equivalent of 6 gms of Nacl = 6 x 100/(2x58.5)
= 600/117
= 5.128 gms
= 5128 mg
1 ltrs of water ------> x ppm
=> 10000 ltrs of water = x * 10000 ppm = 5128mg
=> x =5128/10000= 0.5128 ppm
Hence, the hardness of water is 0.5128 ppm
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