Chemistry A-Level
Colour change range
What Colour change range means in Chemistry A-Level, as defined for AQA.
Definition of Colour change range
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Reference: AQA
Roughly pKIn ± 1, and it must fall entirely within the steep section of the pH curve for the indicator to be usable.
Topics that use Colour change range
- pH curves, titrations and indicators (A-level only) (AQA A-Level)
Related terms
- concordant titres
- Equivalence point
- Indicator
- Required practical 9
- sources of error
- standard solution
- volume increments
- buffer region
Using Colour change range in the exam
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