Edexcel A-Level Chemistry A2 6 P15 Tests for Ions and Gases Questions

Interpret inorganic test observations by linking colour changes, precipitates and gas tests to ions, choosing confirming reagents and using balanced equations and salt formulae.

Exam points

Recall water-test observations when a hydrated salt is heated
Identify transition-metal ions from hydroxide precipitate colours and changes on standing
Choose acidified silver nitrate and ammonia to confirm chloride-ion observations
Write balanced ionic equations for precipitate formation and ammonium-ion testing
Combine positive ion-test results to deduce a charge-balanced salt formula

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