Chemistry A-Level
colour changes on adding reagents
What colour changes on adding reagents means in Chemistry A-Level, as defined for AQA.
Definition of colour changes on adding reagents
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Reference: AQA
Excess ammonia turns copper(II) deep blue, concentrated hydrochloric acid turns it yellow, and cobalt(II) goes from pink to blue.
Topics that use colour changes on adding reagents
- Formation of coloured ions (A-level only) (AQA A-Level)
Related terms
- absorption of visible light
- absorption spectrum
- calibration curve
- complementary colour
- filter selection
- ground state and excited state
- size of the d orbital gap
- standard solutions
Using colour changes on adding reagents in the exam
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