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Qualitative analysis: tests for ions

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Question 33

An unknown salt Y Y\,Y is dissolved in distilled water to prepare a solution. The following chemical tests are performed on separate portions of this solution:

  1. Dilute sodium hydroxide solution is added dropwise. A green precipitate forms. On standing in the air, the top layer of this precipitate slowly turns brown.
  2. Dilute hydrochloric acid is added, followed by barium chloride solution. A dense white precipitate forms.

What is the formula of the unknown salt YYY?

FeCl2\text{FeCl}_2FeCl2​

Fe2(SO4)3\text{Fe}_2(\text{SO}_4)_3Fe2​(SO4​)3​

FeSO4\text{FeSO}_4FeSO4​

Cr2(SO4)3\text{Cr}_2(\text{SO}_4)_3Cr2​(SO4​)3​

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.

Question bank