Ammonia,which is highly toxic to fish because it interferes with their uptake of oxygen,is formed from wastes excreted by the fish,uneaten food,and decaying plants.Beneficial bacteria oxidize the ammonia and ammonium to nitrate,which is not highly toxic to fish in low to moderate levels.Complete and balance the reaction equation in acidic solution.Hint: One half-reaction should be written using NH4+ and NO3-; the other should be written using O2 and H2O.
NH4+(aq)+ O2(aq) NO3-(aq)
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