O R C O K CH OH + 3KOH R’ K O OH
Therefore, potassium soaps are used to make liquid soap and shaving cream. Soaps from highly saturated, solid fats, such as tallow, lard, or shortening, are hard. Saponification of an unsaturated oil, such as olive oil, gives a soft soap. Treatrment of a soap solution with dilute hydrochloric acid produces a mixture of fatty acids.