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How many grams of MgCO3 dissolved per litre gives 84 ppm hardness?

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in Engineering Chemistry II by (789k points)
How many grams of MgCO3 dissolved per litre gives 84 ppm hardness?

(a) 70.56 mg/L

(b) 48.23 mg/L

(c) 81.49mg/L

(d) 66.12 mg/L

This question was posed to me in class test.

The origin of the question is Hardness of Water topic in division Water and its Treatment of Engineering Chemistry II

1 Answer

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Correct answer is (a) 70.56 mg/L

Easy explanation: 70.56 mg/L of MgCO3 dissolved per litre gives 84 ppm hardness.

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