Potassium nitrate: Potassium nitrate is a chemical, ionic, anhydrous substance, composed of nitrate anions and potassium cations, with the structural formula KNO3. This saline mineral compound with a density between 2,1 and 2,2 depending on its purity, soluble in water, is the mineralogists' nitre, characteristic of desert areas, or saltpeter, well known probably before the Middle Ages, to ancient chemists. or collectors-manufacturers of black powder. It was also named in the old nomenclature...
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