Ko te waikawa Phosphoric, e mohiotia ana ko te waikawa orthophosphoric, he waikawa pararopi e whakamahia ana i roto i nga momo ahumahi. He kaha te kaha o te waikawa, ko tana tauira matū ko H3PO4, ko te taumaha ngota ko te 97.995. Kaore i rite ki etahi waikawa wariu, he pumau te waikawa phosphoric me te kore e pakaru ngawari, ka waiho hei whiringa pono mo nga momo tono. Ahakoa te kaha o te waikawa phosphoric ki te hauwai, te sulfuric, te waikawa nitric ranei, he kaha ake i te acetic me te waikawa boric. I tua atu, kei tenei waikawa nga ahuatanga whanui o te waikawa me te mahi hei waikawa iwi ngoikore. He mea tika kia mohio ko te waikawa phosphoric he hygroscopic me te ngawari ki te tango i te makuku mai i te hau. I tua atu, he kaha ki te huri ki te waikawa pyrophosphoric i te wa e wera ana, me te ngaro o te wai ka taea te huri ki te waikawa metaphosphoric.