Calculating Calcium Hardness as CaCO3

The hardness (in mg/L as CaCO3) for any given metallic ion is calculated using Equation

Calcium hardness (m/L) as CaCO3/equivalent weight of CaCO3

= Calcium (mg/L)/equivalent weight of calcium

Example:-

A water sample has calcium content of 51 mg/L. What is this calcium hardness expressed as CaCO3?

Solution
Referring to Equation:

x mg/L /50.045=51 mg/L /20.04

x=51 x 50.045/20.04

=64.9 mg /L Ca as CaCO3

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