GATE CE 2016 Set 1 — Question 60
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Environmental Engineering → Water Quality → pH, Turbidity, Hardness & Alkalinity
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Question
Effluent from an industry 'A' has a pH of 4.2. The effluent from another industry 'B' has double the hydroxyl () ion concentration than the effluent from industry 'A'. pH of effluent from the industry 'B' will be __________
Correct answer
4.4 to 4.6
Solution
Given:
We know that at .
So,
The concentration of hydroxyl ions in effluent A is:
Effluent B has double the hydroxyl ion concentration:
Now, calculate :
Finally, calculate :
The pH of effluent B is approximately 4.5.
We know that at .
So,
The concentration of hydroxyl ions in effluent A is:
Effluent B has double the hydroxyl ion concentration:
Now, calculate :
Finally, calculate :
The pH of effluent B is approximately 4.5.
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