1.

A sample of hard water with hardness 150 ppm is found to containCa(HCO_(3))_(2) and CaCl_(2). If one litre of the smaple on boiling produce 0.108 g CaCO_3), then its permanent hardness is

Answer»

42 ppm
32 ppm
15 ppm
10.8 ppm

SOLUTION :TOTAL hardness of water sample = 150 ppm. 1 litre of water on BOILING produces 0.108 g `CaCO_(3)`.
`rArr"1000 PARTS by weight of water contains 0.108 parts by weight of "CaCO_(3)`.
`=108"parts by weight of "CaCO_(3)`.
`rArr"The temporary hardness of water = 108 ppm."`
`therefore"Permanent hardness of the water sample"`
`=150-108="42 ppm."`


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