The term 'chemical used in making soap' can be summarized as 'POTASH', which is a potassium-rich salt that has been used for centuries to make soap. POTASH is a naturally occurring mineral that is mined from the ground and is composed of potassium carbonate, potassium hydroxide, and other compounds. It is an important ingredient in many soaps and detergents, as it helps to create a lather and increase the cleaning power of the soap.