Presentation on theme: "Chemistry for Changing Times 12 th Edition Hill and Kolb Chapter 21 Household Chemicals: Helps and Hazards John Singer Jackson Community College, Jackson,"— Presentation transcript:
21/2 History of Cleaning Many years ago and even today in the third world, clothes are cleaned by beating on rocks in a river or stream. Some plants such as soapworts or soapberries contain saponins, which produce a soapy lather. Wood ashes contain potassium and sodium carbonate, which form alkaline solutions in water with some detergent properties. Sodium carbonate is still sold today as washing soda.