Discussion
If the total hardness and alkalinity of a sample of water are 350mg/L and 150mg/L (CaCO3 scale) respectively, then its carbonate and non-carbonate hardness (in units of mg/l) will be respectively-
Answer: A
The carbonate and non-carbonate hardness are 150 and 200 mg/L.
Carbonate hardness is the part of total hardness balanced by alkalinity (bicarbonate and carbonate). When alkalinity is less than total hardness, carbonate hardness equals the alkalinity, 150 mg/L, and the rest is non-carbonate hardness: 350 - 150 = 200 mg/L.
The options pairing 150 or 200 with 350 treat total hardness as one of the two parts, but the two parts must add up to the total of 350 mg/L, and 100 does not equal the alkalinity.
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