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Reactions of ions in aqueous solution (A-level only)

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Question 2

An investigator is given two unknown aqueous solutions, X and Y, each containing a different transition metal salt.

The investigator performs a series of chemical tests on both solutions. The observations are recorded in Table 1.

Table 1

TestObservations with XObservations with Y
Add sodium hydroxide solution slowly until in excess.A brown precipitate forms that is insoluble in excess.A green precipitate forms that is insoluble in excess.
Add sodium carbonate solution.A brown precipitate forms. Effervescence is observed.A green precipitate forms.
Add dilute nitric acid and then divide each solution into two portions.No visible change.No visible change.
Add barium chloride solution to the first portion.A white precipitate forms.No visible change.
Add silver nitrate solution to the second portion.No visible change.A white precipitate forms.

Identify the salts present in solutions X and Y using the information in Table 1.

In your answer, you should:

  • Identify X and Y by name or chemical formula.
  • Identify all precipitates formed in the tests.
  • Explain why effervescence is observed in the reaction of sodium carbonate with X but not with Y.
  • Write ionic equations (including state symbols) for all precipitation and gas-producing reactions.
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Reactions of ions in aqueous solution (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Reactions of ions in aqueous solution (A-level only)