GATE CE 2018 Set 1 — Question 61
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Environmental Engineering → Water Quality → Chemical Parameters
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Question
A water sample analysis data is given below.
The carbonate hardness (expressed as mg/L of , up to one decimal place) for the water sample is ______
| Ion | Concentration, mg/L | Atomic Weight |
|---|---|---|
| 60 | 40 | |
| 30 | 24.31 | |
| 400 | 61 |
Correct answer
272 to 274
Solution
1.Calculate Total Hardness (TH):
Hardness is caused by multivalent metallic cations, primarily and .- Equivalent weight of
- Equivalent weight of
- Equivalent weight of
Hardness due to
2.Calculate Total Alkalinity:
Alkalinity is primarily due to in this sample.- Equivalent weight of
3.Calculate Carbonate Hardness (CH):
Rounding to one decimal place, the carbonate hardness is mg/L.
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