A very good overview of Solution Chemistry, including terminology, factors
affecting solution, concentration, and properties of solutions http://members.aol.com/profchm/solution.html
Site looking at how pioneers isolated caustics for making soaps. Includes
a lab description of how potassium carbonate could be isolated from ashes. A
possible extra activity. http://cator.hsc.edu/~kmd/caveman/projects/potash/