1 degree Clarke = 1 part of CaCO3 per _____________ parts of

1-degree-clarke-1-part-of-caco3-per-parts-of

1 degree Clarke = 1 part of CaCO3 per _____________ parts of water.

A. 10,000

B. 30,000

C. 50,000

D. 70,000

The question was asked by my college professor while I was bunking the class.

I’d like to ask this question from Hardness of Water topic in portion Water and its Treatment of Engineering Chemistry II

The correct choice is D. 70,000

To explain I would say: 1 degree Clarke = 1 part of CaCO3 per 70,000 parts of water. It is calculated mathematically.