This question is about identifying ions in chemical compounds.
What colour flame would copper(II) ions produce?
Name a metal ion that would produce a crimson flame.
A waste sample contains a mixture of multiple dissolved metal chlorides. Explain why a simple flame test is unsuitable for identifying all the individual metal cations present in this mixture.
An analyst investigating borehole water suspects contamination by a specific halide. On adding dilute nitric acid followed by silver nitrate solution to the water sample, a cream precipitate is obtained. Name the halide ion present in the water.
Describe a chemical test to show the presence of sulfate ions (SO42−SO_4^{2-}SO42−) in an aqueous solution. Describe the observations that confirm their presence.
Practise AQA GCSE Chemistry Identification of ions by chemical and spectroscopic means (chemistry only) with exam-style questions for Foundation and Higher tier. 30 questions covering Flame tests, Metal hydroxides, Carbonates, Halides, Sulfates, Instrumental methods, and Flame emission spectroscopy, matched to the AQA GCSE Chemistry (8462) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.