The difference between baking powder and baking soda
The appearance of baking powder is generally white fine powder, very small particles, white color, and baking soda color is generally white, is a fine crystalline powder, white color but a sense of luster, slightly whiter than baking powder.
Baking powder, also called foaming powder, the main ingredients are baking soda and corn starch, with some acidic substances as auxiliary ingredients, while the main ingredient of baking soda is sodium bicarbonate, an inorganic salt.
The nature of baking powder is generally neutral, not acidic nor alkaline, while the nature of baking soda is generally alkaline; the fermentation method of baking powder is mainly through the acid-base neutralization reaction in contact with water to produce gas, while the fermentation method of baking soda is mainly through the decomposition of water and heating to produce gas.
Difference in the scope of use
Baking powder is often used in the fermentation of bread, steamed buns, buns, doughnuts and other fluffy pastry; while baking soda is often used in the production of cookies, peach crisp and other high-temperature baked goods.