1, the composition is different. The main component of surface alkali is sodium carbonate, and the main component of baking soda is sodium bicarbonate mixture.
2. The effect is different. Surface alkali can whiten food and remove the odor in dough. Baking soda can be used to make steamed bread, fried dough sticks and other foods, which can make pasta fluffy and taste better.
3. Different methods of use. Surface alkali is generally used for food preservation. Baking soda can be used as foaming agent, and food made of baking soda can be eaten directly.