Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Testing for chlorides (Cl^-), bromides (Br^-) and iodides (I^-)
21 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Explain why nitric acid must be added before silver nitrate when testing a solution for halide ions. Include what could happen if this step is skipped or done in the wrong order.
Question 2
5 marks · Hard
Answer and see the solution →When silver nitrate solution is added to separate solutions of sodium chloride, sodium bromide and sodium iodide (each has first been acidified with dilute nitric acid), different precipitates form.
(a)For each solution, name the precipitate formed and state its colour.
(i)[1 mark]Sodium chloride solution:
(ii)[1 mark]Sodium bromide solution:
(iii)[1 mark]Sodium iodide solution:
(b)Give the chemical formula for the precipitate formed in each case.
(i)[1 mark]From sodium chloride:
(ii)[1 mark]From sodium iodide:
Question 3
2 marks · Hard
Answer and see the solution →Describe the steps you would take to test a solution to determine whether it contains any halide ions (chloride, bromide, or iodide) using silver nitrate.