GATE CE 2021 Set 1 — Question 44
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Environmental Engineering → Wastewater Quantity & Sewerage → Wastewater Characteristics
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Question
Ammonia nitrogen is present in a given wastewater sample as the ammonium ion () and ammonia (). If pH is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement?
Correct answer
(D) At pH 7.0, NH₄^+ will be predominant.
Solution
The equilibrium between ammonium ion and ammonia is given by:The for this reaction is approximately 9.25 at .
- When , .
- When , the acidic form () is predominant.
- When , the basic form () is predominant.
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