The Ca2+ concentration and Mg2+ concentration of a water

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The Ca²⁺ concentration and Mg²⁺ concentration of a water sample are 160 mg/L and 40 mg/L as their ions respectively. The total hardness of this water sample in terms of CaCO₃ in mg/L is approximately equal to

1. 120
2. 200
3. 267
4. 567

Correct Option: D

Total hardness = Ca²⁺ ×	50	+ Mg²⁺ ×	50
	20		12

= 100 ×	50	+ 40 ×	50
	20		12

= 567 mg/L as CaCO₃