Wednesday, 13 February 2013

1.8 explain how information from chromatograms can be used to identify the composition of a mixture.

Chromatography paper is placed in a solvent, the different compounds will travel at different speeds (due to the size of their particles.)

Rf values
The Rf value is calculate by Distance moved by compound divided by Distance moved by solvent.

The shape on the chromatogram can be compared with that of known substances and where they match they are the same substance.


  1. Is the Y-Axis of this graph the Rf values? And the X-Axis time?

  2. The Chemistry Syllabus has changed…

    Here is a New blog for the 2017 Syllabus: