Question
A student runs a paper chromatogram of a food colouring. On the dried chromatogram the solvent front has moved 8.0 cm from the start (base) line. One coloured spot has moved 6.0 cm from the start line.
[2 marks]
Calculation
Type your answer
Include the unit where there is one (e.g. a magnification ×100, or a rate in cm³/min).
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