Testing for chlorides (Cl^-), bromides (Br^-) and iodides (I^-)
3 marks · Easy| Ion in solution | Observation after adding silver nitrate |
|---|---|
| Cl^- | White precipitate |
| Br^- | Cream precipitate |
| I^- | Yellow precipitate |
Use the information in the table to answer the following questions.
State the name and colour of the precipitate formed when a solution containing bromide ions is tested with silver nitrate.
Identify which ion produces a yellow precipitate with silver nitrate.
A student obtains a white precipitate when testing their solution with silver nitrate. Which halide ion is present?
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Silver bromide, cream precipitate
(b) Iodide ion (I^-)
(c) Chloride ion (Cl^-)
Common mistakes: Mixing up colours or names; Omitting precipitate name
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States 'silver bromide' and 'cream precipitate' for bromide ions.
B2 (b) · 1 mark · Identifies iodide ion (I^-) as producing yellow precipitate.
B3 (c) · 1 mark · States chloride ion (Cl^-) for white precipitate.
Worked solution
a) The bromide ion gives a cream precipitate of silver bromide. b) The iodide ion (I^-) gives a yellow precipitate. c) If a white precipitate forms, chloride ion (Cl^-) is present.