Mixtures of coloured substances can be separated by paper chromatography - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2016 - Paper 1
Question 1
Mixtures of coloured substances can be separated by paper chromatography.
(a) Paper chromatography was used to separate a mixture of blue and red inks.
A spot of th... show full transcript
Worked Solution & Example Answer:Mixtures of coloured substances can be separated by paper chromatography - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2016 - Paper 1
Step 1
Give a reason why the start line is drawn in pencil rather than in ink.
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Answer
The start line is drawn in pencil rather than ink because pencil is insoluble in the solvent used for chromatography. If ink were used, it would dissolve and interfere with the results of the separation.
