Learning Objectives.
Understand the expected and actual relationship between concentration of dye in solution and on the fibre.
Relate isotherms to the relative concentrations of dye in solution and on the fibre.

Questions.
1.0 Identify [S]f, [D]f and [D]s
2.0 Give an example of a typical dye / fibre system that follows the Freundlich isotherm
3.0 Explain why the Freundlich adsorption isotherm does not level off.
4.0 Compare the Freundlich, Nerst and Langmuir adsorption isotherms.