Phosphate formula, also referred as Phosphate ion formula or Orthophosphate formula, is explained in this article. This salt of phosphoric acid has 1 central phosphorus atom that is surrounded by 4 oxygen atoms in a tetrahedral shape. A phosphate salt is obtained when a positively charged ion gets connected to the oxygen atoms which are negatively charged and forms an ionic compound. It's commonly found in the form of AMP, ADP, ATP, DNA, and RNA. At standard temperature and pressure, most of the phosphates are insoluble in water. The sodium, rubidium, ammonium phosphates and cesium are all water-soluble whereas the others are either slightly soluble or completely insoluble in water.