Purity, Formulations and Paper Chromotography

• What is a formulation 


  A specific compound for a useful purpose - tied to a formula
• What are the two phases called in chromatography?

  Mobile phase, stationary phase
• In paper chromatography, how many spots will a pure substance form on the paper?

  One
• Give the formula to work out the Rf value of a substance

  Rf = Distance moved by substance / Distance moved by solvent
• Would you expect the Rf value of a substance to change if you changed the solvent used in the chromatography experiment?

  Yes