NaHCO3 – sodium hydrogen carbonate – is a white, water-soluble, crystalline powder. This compound is commonly known as baking soda, which you can find in the grocery store. Sodium hydrogen carbonate is used in fire extinguishers, toothpaste, and medicine. It can also absorb odors, which is why it’s not unheard of to put a cup of baking soda in the refrigerator for a few days. But the most widespread use of sodium bicarbonate is in all kinds of baked goods. It can also be found in jelly, citrus marmalades, jams, powdered milk, dry cream, margarine, hard cheese, tomato concentrate, meat products, and more! It is used as an acidity regulator and leavening agent.