Chemistry · Oct / Nov 2021 · Paper 61 · Question 4
0620
As printed in the paper
The question as text
Tartrazine is used as a yellow food colouring. Plan an investigation to find out if a yellow sweet contains tartrazine. Explain how your results will tell you if the sweet contains tartrazine. You have access to all normal laboratory materials, a yellow sweet and a sample of tartrazine. You may draw a labelled diagram as part of your answer. [6]
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any six from:
dissolve sweet in solvent/water
carry out chromatography
place spot of sweet solution on chromatography paper
place spot of tartrazine on same level/baseline
place/stand paper in solvent/water
let solvent rise to near top of paper
compare height of spot from sweet and tartrazine, if the same sweet contains tartrazine
OR
compare Rf value of spot from sweet with Rf for tartrazine, if the same then sweet contains tartrazine
max 6
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