Question: is it baking soda or baking powder that makes chicken crispy?
Answer: Baking powder, not to be mistaken with baking soda, is a leavening agent usually used in baked goods such as cookies and cakes. It's a mixture of sodium bicarbonate, cream of tartar and cornstarch. When mixed with salt and coated on chicken it dries out the skin, leaving it crisp and crunchy.