Question

if 100ml of h2o contain 0.25g of caco3 then calculate the hardness of water in ppm
​

Answer 1

Explanation:

Water Hardness

calcium carbonate (ppm) designation

0-43 Soft

43-150 Slightly Hard

150-300 Moderately Hard

300-450 Hard

450 Very Hard

Water hardness is usually noticed because of difficulty in lathering soap and the formation of a

scum in the bathtub. Ca2+ and Mg2+ form insoluble salts with soaps causing precipitation of the

soap scum. Another effect of hard water is “boiler scale”. When hard water comes into contact

with dissolved carbonates, a precipitate of insoluble calcium carbonate forms. This “scale” can

build up on