Grade 12Physical Chemistry
a water sample 500 ml has a hardness equivalent to50 ml of 0.1N caso4 .what is the hardness in ppm
a water sample 500 ml has a hardness equivalent to50 ml of 0.1N caso4 .what is the hardness in ppm
1 Answer
Divansh Singla
Normality = No. of gms equivalent per litre
No. of gm equivalents = Normality * volume of CaSO4/1000ml
No. of gm equivalent = wt. in gms / eq wt = 0.1 x 50/1000 = 5 x 10-3
Wt. in gms in 500 ml of water = No. of gms equivalent x eq. wt. of CaSO4
Wt. in gms in 1000 ml of water = 2 x 5 x 10-3 x eq. wt of CaSO4
Hardness due to CaSO4 = Strength of CaSO4 x Chem eq. of CaCO3 / Chem eq. of CaSO4
=10-2 x 50 g/I
= 500 mg/I
=10-2 x 50 g/I
= 500 mg/I
= 500 ppm
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