Results of a water sample analysis are as follows: (milliequivalent

Results of a water sample analysis are as follows:

(milliequivalent weight of CaCO₃ = 50 mg/meq).
Harness of the water sample in mg/L as CaCO₃ is

Hardness = Mg²⁺ ×	equivalent wt of CaCO₃	+ Ca²⁺ ×	equivalent wt of CaCO₃
	equivalent wt of Mg²⁺		equivalent wt of Ca²⁺

= 20 ×	50	+ 55 ×	50
	12.2		20

= 179 mg/l of CaCO₃.