Sodium bicarbonate is a common leavening agent, also known as baking soda. It reacts with acidic components to release carbon dioxide in the baking process to give volume and tender textures. It can also be used in dry-mix beverages to give some carbonation qualities. Ammonium bicarbonate is a leavening agent that is commonly used in flatter baked goods applications. It reacts with acidic components to release carbon dioxide in the baking process to give volume and tender textures.