Get H O3 P 2- = 2po = phosphonate; 3p-phosphate Get H O4 P 2- = pi = hydrogenphosphate ion Get H2 O4 P 1- = 2hp = dihydrogenphosphate ion Get H2 O7 P2 2- = pop = pyrophosphate 2- Get H3 O3 P = phs = phosphonic acid Get H4 O7 P2 = ppv = pyrophosphate Get H5 O10 P3 = 3po = triphosphate