indicator choice
What indicator choice means in Chemistry A-Level, as defined for AQA, OCR.
Definitions of indicator choice
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Reference: OCR
A suitable indicator changes colour close to the equivalence point; phenolphthalein suits a strong acid with a strong base, while methyl orange suits a strong acid with a weak base.
Selecting an indicator with a sharp colour change over the vertical section of the titration curve.
Topics that use indicator choice
- Balanced equations and associated calculations (AQA A-Level)
- Acids (OCR A-Level)
Related terms
- charge balance
- Acid–base titration
- Concentration and mass concentration
- concordant titres
- Distinction between strength and concentration
- Equivalence point
- ionic equations
- Mole calculations from concentration and volume
Using indicator choice in the exam
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