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gcse chemistry question- chromatography

Q. Suggest two things the student should do to improve the separation of the spots

I have use a different solvent, but can't think of a second reason
Thanks in advance
How about 'making sure the chromatography tank is covered'. This stops the solvent evaporating too quickly and helps it wet the paper encouraging spots to travel. Using a longer piece of paper helps. You can also try changing the brand/type of paper as some works better than others. Making the spots on the baseline smaller is also a good trick. I don't know the exact 'correct' answer though!
(edited 1 year ago)
I think tony-dolby is correct, use different chromatography paper, allow the dots more time in the stationary phase, that is longer paper!

https://science-revision.co.uk/chromatography.html

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