How Does Baking Powder Works?
When you hungrily and hopefully watch a cake rise through the window of the oven, it’s doing so because of carbon dioxide bubbles. This gas is released from a reaction between an acid and an alkali in the baking powder you added to the recipe. Baking powder consists of an acid component, such as cream of tartar (a white, acidic powder), an alkali (or base) like bicarbonate of soda (also known as baking soda), and a moisture absorber like cornstarch. When the cream of tartar and baking s more here http://logicalscience.com/2017/05/how-does-baking-powder-works/