Potassium nitrate has a chemical formula of KNO3. The chemical formula is derived from the compound's combination of the potassium ion, written as K with a charge of plus one, and nitrate, written with the formula NO3-, indicating that the ion carries a charge of minus one.
The formula for the compound potassium nitrate indicates that it is a compound containing one atom of potassium, one atom of nitrogen and three atoms of oxygen in each molecule. Potassium nitrate is found in explosive substances such as fertilizer, gunpowder and fireworks. It is an odorless, white solid with a molar mass equal to about 101.10 grams per mole.