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CAIE A-Level Chemistry P3.10 Qualitative Analysis Notes and Tests

Practise selecting tests and using precise observations to identify ions, gases and organic functional groups.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • use the specified reagent, then record precipitate colour, solubility in excess and any no-change result
  • identify a gas only after a confirmatory test, such as ammonia turning damp red litmus paper blue
  • combine cation, anion or organic-test evidence to eliminate alternatives rather than relying on one observation

P3.10—Qualitative analysis notes and tests question 1

[Maximum number: 1]

Compound T is a white crystalline solid.
When a sample of compound T is mixed with aqueous sodium hydroxide and heated, a gas is produced which turns damp red litmus paper blue.

Further testing of a solution of compound T with aqueous barium chloride produces a dense white precipitate which does not dissolve when dilute hydrochloric acid is added to the mixture.

What is the identity of compound T ?

A

ammonium carbonate

B

ammonium sulfate

C

sodium carbonate

D

sodium sulfate

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