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AQA · GCSE · Chemistry · Higher

Improving chromatography colour separation

Q04.4 1 mark

A student used chromatography to investigate the colours in a printer ink.

There were four colours in the printer ink, but only three were visible on the chromatogram.

Suggest how the student could use chromatography to show there were four colours in the printer ink.

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Marking points

  1. 1 Suggests using a different solvent.

Full-mark answer

Repeat the chromatography using a different solvent.

Why this answer loses marks

Run the same chromatogram again.

Unchanged conditions may reproduce the same visible spots; the solvent must be changed.

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