1, the composition is different. Soda is also called alkaline noodles, edible soda ash, edible alkali, etc. Yes, soda is edible alkali, and edible alkali is also called soda, and its chemical formula is called sodium carbonate (Na2Co3), which is a natural raw material, while baking soda generally refers to edible baking soda, and its chemical formula is called sodium bicarbonate (NaHCo3), which is an upgraded raw material made by soda processing, so the composition and structure of the two are different.

2. Different colors. The color of soda is slightly transparent white, the color is not as white as baking soda with a little transparency, while the color of baking soda is white, and it is pure white, very white.

3. Different shapes. From the appearance, soda light is similar to white sugar but smaller in fine sand state, not in powder state, while baking soda is in a very fine white powder state.

4. The smell is different. The smell of soda is pungent, with obvious pungent smell and heavy taste, commonly known as "alkali odor", while the smell of baking soda is very dull, not pungent and without any peculiar smell.

5. Different in nature. The properties of soda are relatively stable, and it does not decompose when it is heated, but it is easily soluble in water, which is alkaline after being mixed with water. However, the properties of baking soda are unstable, easily decomposed when it is heated, and easily dissolved in water, which is easily decomposed into sodium carbonate, carbon dioxide and water when added to water, so the water is weakly alkaline after being dissolved in water.