Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Testing for chlorides (Cl^-), bromides (Br^-) and iodides (I^-)
21 practice questions
Practice questions
1–10 of 10 · Normal
Question 1
2 marks · Normal
Answer and see the solution →Describe the steps you would take to test a solution for the presence of chloride, bromide, and iodide ions using silver nitrate.
Question 2
4 marks · Normal
Answer and see the solution →(a)[1 mark]State the expected observation if chloride ions are present when silver nitrate solution is added after acidifying.
(b)[1 mark]State the expected observation if bromide ions are present when silver nitrate solution is added after acidifying.
(c)[1 mark]State the expected observation if iodide ions are present when silver nitrate solution is added after acidifying.
(d)[1 mark]A student tested a solution using dilute nitric acid and silver nitrate. The result was a cream precipitate. Which ion is present?
Question 3
3 marks · Normal
Answer and see the solution →Explain how you can distinguish between the precipitates formed when chloride, bromide or iodide ions react with silver nitrate. In your answer, refer to both the name and the colour of each precipitate.
Question 4
4 marks · Normal
Answer and see the solution →The table shows the results of silver nitrate tests on four unknown solutions after they were all acidified with dilute nitric acid.
Solution Observation with AgNO3 after acidifying P White precipitate Q Yellow precipitate R No precipitate S Cream precipitate For each solution, write the name and formula of the ion responsible for the observation. If there is no precipitate, state 'none'.
Question 5
1 mark · Normal
Answer and check →A solution is acidified with dilute nitric acid and then tested with silver nitrate. Which observation indicates the presence of bromide ions?
- A.A yellow precipitate forms.
- B.A white precipitate forms.
- C.A cream precipitate forms.
- D.No precipitate forms.
Question 6
2 marks · Normal
Answer and see the solution →State two reasons why nitric acid is used, and not hydrochloric acid, when testing for halide ions with silver nitrate.
Question 7
4 marks · Normal
Answer and see the solution →(a)[2 marks]Name the compounds formed when silver nitrate is added to solutions containing (i) chloride, (ii) bromide, and (iii) iodide ions.
(b)[2 marks]Give the colour of each compound formed in part (a).
Question 8
2 marks · Normal
Answer and see the solution →State the names and colours of the precipitates formed when silver nitrate is added to (a) a solution containing bromide ions and (b) a solution containing iodide ions, after acidification with nitric acid.
Question 9
4 marks · Normal
Answer and see the solution →(a)[3 marks]Describe the steps you would take to test a sample for iodide ions using silver nitrate. Include all reagents added and any important precautions.
(b)[1 mark]What result would indicate that iodide ions are present?
Question 10
3 marks · Normal
Answer and see the solution →A student tests three unknown solutions by first adding dilute nitric acid and then silver nitrate solution. The results are:
Observations for unknown solutions after addition of silver nitrate Solution Observation A white precipitate B cream precipitate C no visible change