GATE CE 2020 Set 2 — Question 62
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Environmental Engineering → Water Quality → pH, Turbidity, Hardness & Alkalinity
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Question
The ion product of water () is 14. If a rain water sample has a pH of 5.6, the concentration of in the sample (in mol/litre, round off to one decimal place), is ________.
Correct answer
3.8 to 4.1
Solution
The ion product of water is given by . Given , we have .
The pH of the sample is 5.6, so mol/L.
Using the ion product: mol/L.
To express this in mol/L: mol/L.
Rounding to one decimal place, the concentration is 4.0.
The pH of the sample is 5.6, so mol/L.
Using the ion product: mol/L.
To express this in mol/L: mol/L.
Rounding to one decimal place, the concentration is 4.0.
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