Gary wanted to find out if some food colourings contained a banned food dye.
He put a drop of each food colouring and the banned food dye onto some special paper. He hung the paper in a beaker of water.
After 10 minutes, the banned food dye and some of the dyes from the food colourings had moved up the paper.Gary’s results are shown below.
(a) Gary wrote the labels on the paper in pencil.Why should he not write them in ink?
(b) Look at Gary’s results.The different dyes in some of the food colourings had moved up the paper.
(i) Which food colouring contained the banned food dye?
(ii) Which food colouring contained the most dyes?
(c) Which food colouring did not dissolve in the water?
(d) Which method did Gary use to separate the dyes?
Please find below the solution to the asked query:
a. He should not write the labels with ink because the ink label itself will start moving along with the colours of the dyes and cause difficulty in interpretation of the results.
b)i)yellow food colouring contained the banned food dye.
ii)The brown food colouring contained most dyes
c) The red food colouring did not dissolve in water
d) The method used is Chromatography.
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