Reactions of halides and silver nitrateEdexcel A-Level Chemistry: Flashcards
What these 14 flashcards ask
- What is formed when solid NaCl is warmed with concentrated H₂SO₄?
- What happens with solid NaBr and concentrated H₂SO₄?
- What happens with solid NaI and concentrated H₂SO₄?
- Oxidation number changes of sulfur with iodide.
- Trend in reducing ability of halide ions.
- Why is I⁻ a better reducing agent than Cl⁻?
- Equation for HI reducing H₂SO₄ to H₂S.
- Reagents for the silver nitrate halide test.
- Why add nitric acid before silver nitrate?
- Colours of AgCl, AgBr, AgI.
- Behaviour of silver halides in ammonia.
- Ionic equation for the silver nitrate test.
- What forms when ammonia and hydrogen chloride gases meet?
- What is formed when HCl gas dissolves in water?
Exam questions on Reactions of halides and silver nitrate
- A technician adds concentrated sulfuric acid, in a fume cupboard, to separate samples of solid sodium chloride, sodium bromide and sodium iodide.Hydrogen iodide reduces sulfuric acid to hydrogen sulfide, H₂S. Deduce the change in oxidation number of sulfur and write a balanced equation for the reaction, in which iodine is also formed.2 marks
- A technician has three unlabelled aqueous solutions, each containing one of sodium chloride, sodium bromide and sodium iodide. She has dilute nitric acid, aqueous silver nitrate, dilute aqueous ammonia and concentrated aqueous ammonia.The precipitate formed in one solution is white and dissolves completely in dilute aqueous ammonia. Identify the halide ion present and give the formula of the ion that makes the precipitate dissolve.2 marks
- A technician adds concentrated sulfuric acid to solid sodium chloride in a fume cupboard. She tests the steamy fumes with a glass rod dipped in concentrated ammonia solution and by bubbling them into water. She then repeats the experiment with solid sodium bromide, which also gives orange-brown fumes and a colourless gas with a choking smell.Explain the three observations made with sodium chloride, using equations where appropriate.3 marks
Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).