Social & Preventive Medicine 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 💡 Explanation 1 meq/ L of hardness of water is equivalent to presence of: ✓ Correct Answer: B. 50 mg calcium bicarbonate in 1 litre of water