ChE Board Practice Questions - PRC Chemical Engineer Licensure Examination Exam

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A water sample contains 120 mg/L of Ca2+ ions and 36 mg/L of Mg2+ ions. What is the total hardness of the water sample expressed in mg/L as CaCO3? (Molar masses: Ca = 40.0 g/mol, Mg = 24.3 g/mol, CaCO3 = 100.1 g/mol)

156 mg/L as CaCO3 300 mg/L as CaCO3 448 mg/L as CaCO3 600 mg/L as CaCO3

Correct Answer:

448 mg/L as CaCO3

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