Question

500ml of a simple water is treated against EDTA solution using it as an indicator consumed 18 ml of 0.04
5 m still and point is reached then calculate hardness of water

Answer 1

60 30 100/60

NaAlO2 82 82 100/164

Al2(SO4)3 342 57 100/114

FeSO4.7H2O 278 139 100/278

H

+

1 1 100/2

HCl 36.5 1 100/73

Units of hardness:-

1. Parts Per Million (ppm):- is the parts of CaCO3 equivalent hardness per 106

parts of water i.e., 1ppm=