Baking Powder Baking Powder is also a dry leavening agent which is a mixture of a weak alkali and a weak acid; it increases the volume and lightens the texture of baked goods. Baking powder works by releasing carbon dioxide (CO2) gas into a batter or dough through an acid-base reaction, causing bubbles in the wet mixture to expand and therefore leavening the mixture. Most commercially available baking powders are made up of an alkaline component (typically sodium bicarbonate also known as baking soda), one or more acid salts(such as cream of tartar), and an inert starch (cornstarch in most cases, though potato starch may also be used). Baking soda is the source of the carbon dioxide, and the acid-base reaction can be generically represented as:
NaHCO3 + H+ → Na+ + CO2 + H2O (2)
The Difference between Baking Soda and Baking Powder
Both baking soda and baking powder are leavening agents, which means they are added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'. Baking powder contains baking soda, but the two substances are used under different conditions. Baking soda is pure sodium bicarbonate. When baking soda is combined with moisture and an acidic ingredient (e.g., yogurt, chocolate, buttermilk, honey), the resulting chemical reaction produces bubbles of carbon dioxide that expand under oven temperatures, causing baked goods to rise. The reaction begins immediately upon mixing the ingredients, so you need to bake recipes which call for