Calculate the temporary hardness and total hardness of a sample of water containing magnesium bicarbonate, 73 mg/L; Calcium bicarbonate, 162 mg/L, magnesium chloride, 95 mg/L, Calcium sulphate, 136 mg/L
calculation of CaCO3 equivalents:
Constituent Multiplication factorCaCO3 equivalent
Mg(HCO3)2= 73mg/L 100/146 73X100/146= 50mg/L
Ca(HCO3)2= 162mg/L 100/162 162X100/162=100mg/L
MgCl2= 95mg/L 100/95 95X100/95= 100mg/L
CaSO4=136mg/L 100/136 136X100/136= 100mg/LT
Therefore, Temporary hardness of water due to magnesium biocarbonate and Calcium biocarbonate
=100 + 50 = 150
150mg/L or ppm.
Total hardness of water= 50+100+100+100=350 mg/L or ppm.
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