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A water sample contains 150 mg/L of Calcium, 50 mg/L of magnesium, and 11 mg/L of...

A water sample contains 150 mg/L of Calcium, 50 mg/L of magnesium, and 11 mg/L of iron. What is the total hardness?

Choices:

A) 150 mg/L

B) 6 meq/L

C) 600 mg/L as CaCO3

D) 405 mg/L as CaCO3

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