Mixtures and Chromotography

• Lid

  Helps to stop the solvent from evaporating
• The chemical properties of the substances in a mixture are unchanged
• Solvent in paper chromatography

  The point that the solvent reaches as it moves up the paper
• Mixture

  Two or more elements or compounds that are combined, but not chemically bonded together
• Separation of a mixture

  A physical process because it does not involve any chemical reactions, and no new substances are made
• The line should be drawn in pencil-pen contains ink that will dissolve in the solvent
• Paper chromatography

  1. Put a dot of the dye mixture on the pencil line

  2. Place the filter paper in solvent (solvent should be below the pencil line)

  3. Each different dye in the mixture will move up the paper at a different rate, separating out the dyes

  4. You'll end up with three separate spots on your chromatogram (provided all three dyes dissolve in the solvent)
• If you're carrying out several paper chromatography experiments and comparing their chromatograms, you'll need to use the same solvent in each to make it a fair test