Wednesday, October 20, 2010

Chromatography Lab

  During class, we did Experiment 3B, "Separation of a Mixture by Paper Chromatography". As we learned last class, Chromatography is one of the techniques used to separate components in a mixture. In the lab we did, we demonstrated chromatography by applying a sample of food colouring to a pointed stip of paper then inserted in a test tube with 2cm of water inside, and did the same for two other samples. We observed each one as their colours expanded and rose upwards, for around 20 minutes, then calculated the ratio of the distance traveled by the solute to the distance traveled by the solvent.
Here is the equation we used: Rf=  d1 / d2

Next class is our Ch. 1 and 2 TEST!!!! Make sure to bring your calculator!


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