You are viewing a free preview of this lesson.
Subscribe to unlock all 10 lessons in this course and every other course on LearningBro.
This lesson covers the Core Practical on paper chromatography as required by the Edexcel GCSE Combined Science specification (1SC0). You need to know how to carry out the practical, calculate Rf values, interpret chromatograms, and identify whether substances are pure or mixtures.
To use paper chromatography to separate and identify the coloured components (dyes) in food colourings or inks, and to calculate Rf values.
| Item | Purpose |
|---|---|
| Chromatography paper | The stationary phase |
| Pencil | To draw the baseline (insoluble in solvent) |
| Ruler | To measure distances |
| Beaker or chromatography tank | To hold the solvent |
| Solvent (e.g. water or ethanol) | The mobile phase |
| Capillary tube or spotting tile | To apply small spots of sample |
| Known reference dyes | To compare with unknown samples |
| Watch glass or cling film | To cover the beaker and prevent evaporation |
Subscribe to continue reading
Get full access to this lesson and all 10 lessons in this course.