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Quiz yourself on Purity & FormulationsGet your flashcardsBuild my revision planTrack my progress🔬 Paper Chromatography — Interactive Diagram
Click each part to explore the chromatography setup and results
How Impurities Shift the Points
- Impurities lower the melting point
- Impurities raise the boiling point
- Melting/boiling occurs over a range rather than a fixed point
Quick Check: A sample of aspirin melts over the range 132–136 °C. Pure aspirin melts at 135 °C. What does this tell you?
The sample contains impurities. The depressed melting point and broad range both indicate the aspirin is not pure.
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