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For a sample of water with the ionic composition shown in the figure below, the carbonate and non-carbonate hardness concentration (in mg/I as CaCO3), respectively are:
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- 200 and 50
- 175 and 75
- 75 and 175
- 50 and 200
Correct Option: C
Carbonate hardness = 3.5 × 10–3 g-eq.
| = 3.5 × 10–3 × | as CaCO3 | |
| l |
= 175 mg/l as CaCO3
Non carbonate Hardness = Total hardness – carbonate hardness
Total hardness = 5 × 50 mg/l as CaCO3
= 250 mg/l as CaCO3
∴ Non carbonate hardness = 250 – 175 = 75 mg/l as CaCO3
