Experiment 2D

Topics: Chromatography, Color, Separation process Pages: 2 (502 words) Published: October 26, 2014
Experiment 2D: Separation of a Mixture by Paper Chromatography

Questions:
1.A. The food colourings tested on table 1 did not contain any of the approved dyes found on table 3. B. The colours that did not correspond to any of the approved dyes were all three tested colours: red, blue and yellow. 2.When the mixture green was tested, there was a yellow line that wasn’t perfectly straight that went 4.0 cm up the paper and an erratic blue line that went 5.3cm. 3.The components in the unknown mixture were not approved dyes for food colourings because the ratio of fronts of the unknown mixture did match with any of the ratio of fronts of the approved dyes. Blue, red and yellow had the ratio of 0.96, 0.73 and 0.71 which are not exact to the ratio of approved dyes. The colours that separated from the unknown mixture were also very unclear and murky unlike the approved dyes which would clear and distinguishable. 4.On chromatography paper, liquids get soaked up which is why it’s the perfect material for liquid mixture separation experiments but is also the reason why pencil is used as a marker instead of pen. Ink will only get in the way of the mixture being tested as it will travel up the paper along with the solvent. 5.The colours blue, red and yellow are base colours meaning there are no colours that make them appear that way, they are what they are. Green is a colour that is classified as a mixture because the colours blue and yellow are mixed together to create that colour. Follow-up Questions:

1.The food colouring orange was made of the two base colours, red and yellow. On figure 2D-5, the uppermost marker is most likely yellow#6 which has a ratio of fronts in the higher end but not extremely close to the solvent front. The marker at the bottom end is most likely red#3 which has a ratio of 0.41. This marker is below the halfway point which can only mean red#3 as the list of yellows from table#4 does not go below a ratio of 0.50. 2.The two components of...
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