Reactions of halide ionsAQA A-Level Chemistry: Mind map

Exam questions on Reactions of halide ions

1. A technician reacts solid sodium chloride, solid sodium bromide and solid sodium iodide, in separate tests in a fume cupboard, with concentrated sulfuric acid.
   Chloride ions do not reduce concentrated sulfuric acid but iodide ions do. Explain why iodide ions are the better reducing agent.2 marks
2. A student has a colourless aqueous solution of an unknown sodium halide. She adds dilute nitric acid followed by aqueous silver nitrate and obtains a cream precipitate.
   The student adds dilute ammonia solution to the cream precipitate and then concentrated ammonia solution. State what she observes and how this confirms the halide.2 marks
3. A student is given a colourless aqueous solution that may contain carbonate ions, sulfate ions and chloride ions. She tests separate portions of the solution.
   Describe the tests she should carry out to show that the solution contains carbonate ions and sulfate ions, and the positive result for each.3 marks