1.

Ammonia nitrogen is present in a given wastewater sample as the ammonium ion (NH4+) and ammonia (NH3). If pH is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement?

A. At pH 7.0, NH4+ will be predominant.
B. At pH below 9.25, NH3 will be predominant.
C. At pH below 7.0 NH4+ and NH3 will be found in equal measures
D. At pH 9.25, only NH4+ will be present
Answer» B. At pH below 9.25, NH3 will be predominant.


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