QQuestion
A student was instructed by the teacher to prepare and collect ammonia gas in the laboratory by using aluminium nitride. The student had set up the apparatus as shown in the diagram below. Study the given diagram and answer the following questions:
(a) Name the substance X added through the thistle funnel by the student.
(b) Write a balanced equation for the reaction occurring between Aluminium nitride and substance X.
(c) Identify the substance Y.
(d) State the function of Y.
(e) Why could the student not collect ammonia gas at the end of the experiment?
✓Answer
(a) X — Water
(b) AlN + 3H2O ⟶ Al(OH)3 + NH3↑
(c) Y — Quicklime (CaO)
(d) Substance Y — Quicklime (CaO) is used as a drying agent
(e) Ammonia gas is highly soluble in water so it cannot be collected over water hence it is collected by the downward displacement of air.
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