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This page belongs to a small goup of stundents who put in time for blog posts regarding the gr.11 chemistry curiculum. We post blogs of previous class lessons in our own terms for future use and for other students who find use of it. Enjoy... :D

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Thursday, October 20, 2011

Paper Chromatography lab

In Lab 3B, one was able to experiment on Chromatography (particularly on sheet chromatography)

Sheet chromatography is a separation technique that involves using a thin layer of absorbent sheet. In the lab, we dotted a spot on each strip of sheet and dipped it into water. Slowly, the colours spreaded and we were able to see the components  that made up each colour as it develops. With the experiment, we were able to calculate the Rfs (ratio of fronts) of each colour. We could calculate the Rf by using this formula: Distance #1 divided by Distance #2. In other words. the distance from D1 (where the spot spreaded to) to origin divided by solvent front (where the water rose to) to origin.
*the Rf value will always be between 0 to 1.
With the Rf determined, we were able to distinguish the component colours. (secondary colours separated into primary colours)
Overall, the lab was a very interesting experience.

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