Chemistry A-Level
filter selection
What filter selection means in Chemistry A-Level, as defined for AQA.
Definition of filter selection
Check what you remember
Read the wording for your board, then hide it and explain filter selection in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Choosing the filter that transmits the light the solution absorbs most strongly, which is the complementary colour to the one you see.
Topics that use filter selection
- Formation of coloured ions (A-level only) (AQA A-Level)
Related terms
- absorption of visible light
- absorption spectrum
- calibration curve
- colour changes on adding reagents
- complementary colour
- ground state and excited state
- size of the d orbital gap
- standard solutions
Using filter selection in the exam
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