A water-treatment quality analyst is testing a sample of industrial runoff, WWW, suspected of containing a metal cation. Upon adding a few drops of dilute sodium hydroxide solution, a white precipitate is observed.
Explain why the metal cation in W W\,W cannot be identified with certainty from this observation alone.
Practise Edexcel GCSE Chemistry Qualitative analysis: tests for ions with exam-style questions for Foundation and Higher tier. 127 questions, matched to the Edexcel GCSE Chemistry (1CH0) 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.
