Question -
Answer -
Temporary hardness ofwater is due to the presence of bicarbonates of calcium and magnesium in wateri.e., Ca(HCO3)2┬аand Mg(HCO3) in water. Permanent hardness of water is due tothe presence of soluble chlorides and sulphates of calcium and magnesium i.e.,CaCl2, CaS04, MgCl2┬аand MgS04.