Ammonium iodide contains oppositely charged ions.
State the formula of each ion.
Positive ion:
Negative ion:
Describe a chemical test to show that a substance contains ammonium ions and state the observation.
Describe a chemical test to show that a substance contains iodide ions and state the observation.
Ammonium iodide decomposes when heated:
NH4I(s)⇌NH3(g)+HI(g) \text{NH}_4\text{I}(\text{s}) \rightleftharpoons \text{NH}_3(\text{g}) + \text{HI}(\text{g}) NH4I(s)⇌NH3(g)+HI(g)What does the ⇌\rightleftharpoons⇌ symbol indicate about the reaction?
The reaction between ammonia and hydrogen iodide can be used to illustrate diffusion using the following apparatus.
After a few minutes, a white solid appears inside the tube.
Identify the white solid.
What does the diagram show about the speed of the ammonia molecules compared to the speed of the hydrogen iodide molecules?
State the main hazard when using concentrated hydriodic acid in the experiment in (d). Suggest one precaution you could use to minimise this hazard.
