* Baking powder. Baking powder is a combination of baking soda and an acid, such as cream of tartar. When baking powder is added to water, the acid reacts with the baking soda to produce carbon dioxide gas, which causes baked goods to rise. Baking powder can be used as a substitute for natron in most recipes, but it may be necessary to adjust the amount of baking powder used.

* Baking soda. Baking soda is a sodium bicarbonate that is used as a leavening agent in baking. When baking soda is added to water, it produces carbon dioxide gas, which causes baked goods to rise. Baking soda can be used as a substitute for natron in most recipes, but it may be necessary to adjust the amount of baking soda used.

* Potassium bicarbonate. Potassium bicarbonate is a potassium salt that is used as a leavening agent in baking. When potassium bicarbonate is added to water, it produces carbon dioxide gas, which causes baked goods to rise. Potassium bicarbonate can be used as a substitute for natron in most recipes, but it may be necessary to adjust the amount of potassium bicarbonate used.