I-Phosphoric acid, eyaziwa nangokuthi i-orthophosphoric acid, iyi-asidi ye-inorganic evame ukusetshenziswa ezimbonini ezihlukahlukene. Ine-asidi eqinile ngokumaphakathi, ifomula yayo yamakhemikhali yi-H3PO4, futhi isisindo sayo samangqamuzana ngu-97.995. Ngokungafani namanye ama-acids aguquguqukayo, i-phosphoric acid izinzile futhi ayibhidliki kalula, okwenza kube ukukhetha okuthembekile kwezinhlelo zokusebenza ezihlukahlukene. Nakuba i-phosphoric acid ingaqinile njenge-hydrochloric, sulfuric, noma i-nitric acid, inamandla kune-acetic ne-boric acid. Ngaphezu kwalokho, le acid inezakhiwo ezijwayelekile ze-asidi futhi isebenza njenge-asidi ye-tribasic ebuthakathaka. Kuyaqapheleka ukuthi i-phosphoric acid iyi-hygroscopic futhi imunca kalula umswakama ovela emoyeni. Ngaphezu kwalokho, inamandla okuguqula i-pyrophosphoric acid lapho ishisa, futhi ukulahlekelwa kwamanzi okulandelayo kungawuguqula ku-metaphosphoric acid.