chromatography

Cards (6)

  • draw pencil line across chromatography paper 1cm from bottom
  • use a pipette to to add small dots of each food dye equally spread as well as unknown food dye
  • place paper into a beaker with a solvent(water) making sure pencil line is above water
  • observe as solvent rises(mobile phase) but remove paper before it reaches top
  • allow paper to dry, measure how distance travelled by solvent and also distance travelled by each pigment in each dye
  • Rf= distance travelled by substance / distance travelled by solvent