• Created by: Mich112
  • Created on: 02-11-18 18:30

How to you complete a chromotography experiment

  • Cut the paper so that it doesn't reach to bottom of an empty beaker
  • Fasten a piece of paper to a pencil or splint
  • Draw a pencil line about 2cm from the bottom of the paper
  • Drop a sample of each colouring on the pencil line and let it dry
  • Label the samples on the paper using a pencil
  • Put about 1cm depth of solvent into the beaker
  • Put the paper into the beaker so that the end of it just dips into the solvent
  • Leave the paper in the solvent until the solvent has nearly reached the top of the paper
  • Remove the paper from the solvent and use a pencil to mark where the solvent ahs reached
  • Allow the paper to dry, then measure the distance between your original pencil line and the line the solvent reached
  • Measure the distance of each spot from the orignal pencil line
  • Calculate the Rf value for each substance in the dyes by dividing the distance each substance has travelled by the distance the solvent has travelled
  • Compare the Rf values of different substances to try to identify them

Rf = Distance moved by ink ÷ Distance moved by solvent

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