Baking soda is a white, crystalline powder that is commonly used as a leavening agent in baking. It is also known as sodium bicarbonate, and has a slightly salty, alkaline taste. Baking soda reacts with acidic ingredients, such as vinegar or lemon juice, to produce carbon dioxide, which causes dough or batter to rise. In addition to baking, baking soda has many household uses, such as cleaning and deodorizing.
It can also be used as a natural remedy for heartburn and other digestive issues. Baking soda is usually sold in 500g boxes or bags.