WHAT IS BAKING POWDER?
It is also a rising agent and a popular one just like baking soda. It is made up of baking soda & acidic nature ingredient like cream of tartar. It is a double acting rising agent, once it will activate while you mix it with batter or dough and after that it will rise when batter or dough will be heated. In cakes baking powder is used to rise it. It is also used in recipes in which we don’t use acidic nature ingredient like vinegar, lemon juice or curd.
WHY I USE BOTH IN MY
Sometimes one agent is not enough to rise cake therefore we have to use both. I used baking soda to rise batter of cake and give it a brown color, and I use baking powder to rise it while cake is heating. So this is a simple answer for many questions.
I think after this you all get some idea about baking powder & baking soda.