Multiple choice

The alkalinity and the hardness of a water sample are 250 mg/L and 350 mg/L as CaCO3, respectively. The water has

  1. 350 mg/L carbonate hardness and zero non-carbonate hardness

  2. 250 mg/L carbonate hardness and 100 mg/L non-carbonate hardness

  3. 250 mg/L carbonate hardness and 350 mg/L non-carbonate hardness

  4. 250 mg/L carbonate hardness and zero non-carbonate hardness

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Alkalinity and hardness of water sample whichever is lower should be treated as hardness of the water sample as $CaCO_3$. Hence, 250 mg\L carbonate hardness and zero non-carbonate hardness.

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