What are two known substances in baking powder?

1. Baking soda (sodium bicarbonate): This is the primary leavening agent, producing carbon dioxide gas when mixed with an acid.

2. An acidic ingredient: This could be any of a variety of acids, such as:

* Cream of tartar (potassium bitartrate): This is a common acid in baking powder.

* Monocalcium phosphate (MCP): This is another common acidic ingredient.

* Sodium aluminum sulfate (SAS): This is a less common acidic ingredient.

Baking powder typically contains a combination of baking soda and one or more acidic ingredients, along with a drying agent like cornstarch to prevent clumping.