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Qualitative analysis: tests for ions

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Question 16

An environmental chemist tests a run-off sample from an industrial site to identify a dissolved ionic compound. The chemist performs two qualitative tests:

  • Test 1: Sodium hydroxide solution, NaOH(aq)\text{NaOH}(aq)NaOH(aq), is added dropwise. A dirty green precipitate forms which is insoluble in excess.
  • Test 2: Dilute nitric acid is added, followed by silver nitrate solution, AgNO3(aq)\text{AgNO}_3(aq)AgNO3​(aq). A cream precipitate forms.

Which of the following is the correct formula of the anhydrous salt identified by these tests?

FeCl2\text{FeCl}_2FeCl2​

FeBr3\text{FeBr}_3FeBr3​

FeBr2\text{FeBr}_2FeBr2​

FeI2\text{FeI}_2FeI2​

Qualitative analysis: tests for ions Questions

  1. GCSE
  2. /Chemistry
  3. /Qualitative analysis: tests for ions

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.

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