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Some students used paper chromatography to separate the pigments in purple ink - VCE - SSCE Chemistry - Question 20 - 2005 - Paper 1
Question 20
Some students used paper chromatography to separate the pigments in purple ink. They set up a chromatogram and after 15 minutes the colours had separated as shown in... show full transcript
Worked Solution & Example Answer:Some students used paper chromatography to separate the pigments in purple ink - VCE - SSCE Chemistry - Question 20 - 2005 - Paper 1
Step 1
Which one of the following diagrams is most likely to indicate the appearance of the chromatogram after a further 30 minutes?
Answer
After an additional 30 minutes, the chromatogram will continue to show separation of the pigments as they migrate further up the paper strip. Given that at 15 minutes, the pigments are already separated, we would expect to see an increase in the distance traveled by each pigment.
The diagram that best represents the situation after a total of 45 minutes of migration is option C, where the pigments are still separated and the solvent front has also moved further up the strip.