Question detail
During the laboratory preparation of an ammonium salt, why is it important to add the acid slowly to the ammonia solution?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The Haber process and the use of NPK fertilisers
Question
- A. To avoid the formation of a precipitate
- B. To control the temperature and prevent vigorous exothermic reaction
- C. To ensure complete conversion of ammonia to the salt
- D. To prevent the loss of ammonia gas by evaporation
Answer
The correct option is To control the temperature and prevent vigorous exothermic reaction. This answer is correct because it matches the approved learning objective to prepare an ammonium salt. (Chemistry only; AT 4) in the subtopic Production and uses of NPK fertilisers.
Explanation
The correct option is To control the temperature and prevent vigorous exothermic reaction. To control the temperature and prevent vigorous exothermic reaction is correct because it directly supports the approved learning objective to prepare an ammonium salt. (Chemistry only; AT 4). This belongs to the subtopic Production and uses of NPK fertilisers within The Haber process and the use of NPK fertilisers, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Production and uses of NPK fertilisers.
Common mistake
Common Mistake in Preparing Ammonium Salts
Students often confuse the preparation of ammonium salts with the preparation of other types of salts, leading to incorrect methods being used.
Focus on the specific reactants and conditions required for ammonium salt preparation, such as using ammonia and an appropriate acid.
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