The hardness of a water sample (in terms of equivalents of ) containing is :
(molar mass of )
10 ppm
90 ppm
100 ppm
50 ppm
Molar Mass -
The mass of one mole of a substance in grams is called its molar mass.
- wherein
Molar mass of water = 18 g mol-1
Hardness is most commonly expressed as milligrams of calcium carbonate equivalent per litre. Water containing calcium carbonate at concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l
as we learn
in equlibrium
initial
a 1,5a
at eg.
at eg
10 ppm
Option 2)90 ppm
Option 3)100 ppm
Option 4)50 ppm
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