diagram of the practical, solvent - what is the mobile phase?, the chromatography paper - what is the stationary phase?, water and sometimes alcohol - what is the solvent?, they have different solubilities and travel at different rates up the paper - why do the colours/dots separate?, it will stay on the pencil line, could try a different solvent - How do you identify an insoluble substance?, to stop the solvent from evaporating? - why could you try a lid in chromatography?, rf value = distance travelled by the dot/distance travelled by the solvent - How do you calculate rf value?, because ink would dissolve in the solvent - why do you use a pencil line?,

Required Practical: Chromatography

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