The chemical formula for aluminum sulfide is AI2S3. Aluminum oxide reacts with sodium bicarbonate to create a foam and decomposes at temperatures of between 580-900 degrees C.
This chemical combination is often used to lower the pH balance in soil, which gardeners find extremely valuable. It occurs naturally as a mineral and can be purchased in bulk in many garden stores.
Another use for aluminum sulfate is for water purification. This chemical compound causes impurities in drinking water to coagulate, making them easy to remove.
Other uses for aluminum sulfate include baking powder, antiperspirants, styptic pencils and when mixed with potassium, is used in fire extinguishers.