# I have a question ... in my method of measurements of Moisture in Cosmetics by the distillation technique, it is recommended to use Saturated toluene (saturated with water). Can you inform me how to prepare this saturated solution of toluene and water?

The solubility of water in toluene is pretty minimal. Nevertheless toluene will support SOME water content. As always, saturation specifies an equilibrium concentration....I used to do this with ""^2H_2O...and then use the toluene solution to label other beasts.