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Question
How is hardness represented?
Options:
A .  Hardness = 2 ( Ca²⁺) +2( Mg²⁺)
B .  Hardness = Ca ²⁺ + 2 (Mg ²⁺)
C .  Hardness = 3(Ca ²⁺) + Mg ²⁺
D .  Hardness = 3(Ca ²⁺) +2( Mg²⁺)
Answer: Option A
Answer: (a).Hardness = 2 ( Ca²⁺) +2( Mg²⁺)
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