Potassium Nitrate formula, also called as Saltpeter formula or Nitrate of potash formula is discussed in this article. This alkali metal nitrate is an ionic salt of potassium ions and nitrate ions. It's a natural source of nitrate and is used as a constituent in food preservatives, rocket propellants, fertilizers and tree stump removal. The chemical formula of Potassium Nitrate is KNO3. It is a crystalline solid white to dirty grey in color, which is odorless and has a cooling, saline pungent taste. It seems as a colorless gas and its fumes having a pungent irritating odor. It is colorless and is in its anhydrous form. In its natural form, it occurs as a mineral nitro. It's a powerful oxidizer and is widely used in the production of in medicine, fertilizers, and making gunpowder.