Chromatography

• What is a solvent?

  A liquid that will dissolve substances.
• What is Chromatography good?

  Because it can help us identify an unknown substance.
• how do you calculate the Rf value for a substance?

  Rf = distance travelled by the substance / distance travelled by the solvent
• What is the unit for Rf?

  There is no unit.
• What do you do if different substances have the same have the same Rf value?

  Repeat the experiment using a different solvent.
• What happens if the substance has never been analysed before?

  There will be no Rf value on the database, so we would need to carry out further analysis to identify it.
• Look at Paper 1 for further questions

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