CAIE A Level Chemistry 9701 · Nitrogen and sulfur
Ammonia gas is bubbled through concentrated nitric acid, , to form ammonium nitrate, , which is used as a fertiliser. Suggest why ammonia is basic, and describe the structure of the ammonium ion formed. Suggest why the reaction is described as an acid–base reaction.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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