What does baking powder consist of as mixture?

Baking powder is a mixture of:

* Baking soda (sodium bicarbonate): This is the main leavening agent, releasing carbon dioxide gas when combined with moisture and heat.

* Acid: This is needed to activate the baking soda. Common acids used include:

* Tartaric acid: Often found in cream of tartar.

* Monocalcium phosphate: Also known as "acid phosphate."

* Sodium aluminum sulfate: This is a cheaper option, but can result in a slightly metallic taste.

* Starch: This is a filler that helps prevent clumping and absorbs moisture, which helps keep the baking powder fresh.

The proportions of each ingredient can vary depending on the specific type of baking powder.