1 meq/ L of hardness of water is equivalent to presence of:: (A) 25 mg calcium bicarbonate in 1 litre of water, (B) 50 mg calcium bicarbonate in 1 litre of water, (C) 100 mg calcium bicarbonate in 1 litre of water, (D) 150 mg calcium bicarbonate in 1 litre of water
Answer is B. Hardness of water is expressed in meq/L. 1 meq/L of hardness producing ion is equal to 5o mg of calcium bicarbonate in 1 litre of water. Ref: Park 21st edition page: 671.