Chemistry A-Level
pH colour-change ranges
What pH colour-change ranges means in Chemistry A-Level, as defined for OCR.
Definition of pH colour-change ranges
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Read the wording for your board, then hide it and explain pH colour-change ranges in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Each indicator changes colour over a characteristic pH range, such as roughly pH 8.2–10.0 for phenolphthalein or roughly pH 3.1–4.4 for methyl orange.
Topics that use pH colour-change ranges
- Use of apparatus and techniques (OCR A-Level)
Related terms
- Calculating and interpreting the titre
- Cation tests with sodium hydroxide
- Clock reaction
- Collecting data over time to determine rate
- Condenser water flow and safety
- Continuous monitoring method
- Controlling variables to isolate concentration effects
- Correct reading technique for scales
Using pH colour-change ranges in the exam
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