The exhausted permutit then required 1500L of NaCl containing 117mg of NaCl per litre for regeneration. Calculate the hardness of water sample.

FE > Semester 1 > Applied Chemistry 1

Marks : 04

Years : DEC 2015

$$117mg \text { of } NaCL = 1 \text {Litre} $$

$1500$ liters solution contains $= 1500 x 117 = 175500mg$ of NaCL

Now,

$CaCO_3$ equivalent $= 175500×\dfrac {100}{2×58.5}=15×10^4 \text {mg of } CaCO_3/ ppm$

$$ ∴75×10^3 \text { litre} →x $$ $$∴x=15×75×10^7 \ =1125×10^7 $$

Hardness of water sample $= 1125 \times 10^7$