Chromatography

• chromatography seperates dyes and chemicals based upon their solubility
• Chromatography method:

  1. A pencil line is drawn at bottom of a piece of chromatography paper (pencil line won't move)
  2. mixture is dotted onto the line
  3. end is placed into a solvent below pencil line
  4. solvent moves up paper and carries dye with it
  5. most soluble dyes are carried the furthest and least = shortest
• if dot of mixture has not moved up paper -> not soluble in solvent
• pure substances = contain only one substance
• reference line is drawn in a substance not soluble in the solvent
• the same substance will travel the same distance
• dot that has travelled furthest = most soluble in the solvent
• the reference line doesn't always start at 0 so be careful!