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Edexcel IAL Chemistry 17.22 observations and equations for transition-metal tests

For each test, pair the observation with the species: write the hydroxide precipitate or ammine complex, then state whether excess reagent dissolves it.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Record hydroxide precipitate colours for Fe2+, Fe3+, Cu2+, Cr3+, Co2+ or Ni2+.
  • Write equations for aqua ions reacting with OH- or NH3 to form precipitates.
  • Describe excess NaOH or NH3 behaviour, including dissolving amphoteric or ammine complexes.

17.22—Record observations and write suitable equations for the reactions of Cr3+(aq), Mn2+(aq), Fe2+(aq), Fe3+(aq), Co2+(aq) question 1

[Maximum number: 1]

This question is about copper and some of its compounds.

Two tests were carried out on separate samples of an aqueous solution of copper(II) sulfate.

Test 1

A few drops of aqueous sodium hydroxide were added to a sample of the copper(II) sulfate solution.

State what you would see.

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