Calculating Magnesium Hardness as CaCO3

To calculate magnesium hardness, we use this Equation 

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

= magnesium (mg/L)/equivalent weight of magnesium

Example:-

A sample of water contains 24 mg/L magnesium. Express this magnesium hardness as CaCO3
Solution
Referring to Equation:

x mg/L /50.045=24 mg/L /12.15

x=24 x 50.045/12.15

=98.9 mg /L