Has athe levening agent been decreased in your baking soda?

Answer 1

Baking soda is only a leavening agent in recipes that contain some kind of acetic ingredient such as vinegar, citrus juice, or sour cream. Baking soda is simply bicarbonate of soda, a chemical that is always the same substance.

Baking power is more commonly used as a leavening agent because it contains cream of tartar (or some other acidic compound) to cause the production of carbon dioxide.