I-Phosphoric acid, ekwabizwa ngokuba yi-orthophosphoric acid, yiasidi ye-inorganic esetyenziswa rhoqo kumashishini ahlukeneyo. Inomlinganiselo we-asidi eqinile, ifomula yayo yeekhemikhali yi-H3PO4, kwaye ubunzima bayo be-molecular yi-97.995. Ngokungafaniyo nezinye i-asidi eziguquguqukayo, i-asidi ye-phosphoric izinzile kwaye ayiphuli ngokulula, iyenza ibe yinto ethembekileyo yokukhetha izicelo ezahlukeneyo. Nangona i-asidi ye-phosphoric ingenamandla njenge-hydrochloric, i-sulfuric, okanye i-nitric acids, yomelele kune-acetic kunye ne-boric acids. Ngaphezu koko, le asidi ineempawu eziqhelekileyo ze-asidi kwaye isebenza njenge-asidi ye-tribasic ebuthathaka. Kuyafaneleka ukuba uqaphele ukuba i-asidi ye-phosphoric i-hygroscopic kwaye ithatha ngokulula ukufuma emoyeni. Ukongezelela, inamandla okuguqula i-pyrophosphoric acid xa ishushu, kwaye ukulahleka kwamanzi okulandelayo kunokuguqula kwi-metaphosphoric acid.