Phenolphthalein is the classic indicator for acid-base titrations, used widely in early chemical education. It also serves as a component of universal indicator, together with methyl red, bromothymol blue, and thymol blue.
| CAS Number | 77-09-8 |
|---|---|
| pH Range | 8.2 – 10.0 |
| Colour | none – red |
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