Discussion
The calcium carbonate equivalent of a salt is obtained by multiplying its mass by
Answer: A
Correct answer: 100 divided by its own molar mass
The conversion scales the mass in the ratio of the two chemical equivalents, and since calcium carbonate has a molar mass of 100 with two equivalents per mole, that ratio comes out as 100 divided by the molar mass of the salt for any divalent hardness salt. So 111 mg/L of calcium chloride, whose molar mass is 111, is exactly 100 mg/L as calcium carbonate.
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