water in water quantitative formation of H5P3O10 by hydrolysis of trimetaphosphoric acid;;

water in diethyl ether dissolving M-P2O5 in ether containing a small amount of water;;

water in water byproducts: H4P2O7; hydrolysis; a soln. prepared at 0 °C contains after 2 h tetrametaphosphoric acid H4P4O12, triphosphoric acid H5P3O10, H3PO4, trimetaphsophoric acid H3P3O9, H4P2O7, polymer phosphoric acids and a small amount of iso-tetrametaphosphoric acid;; compounds detected by paper chromatography; content after 2 h: 75 percent H4P4O12, 15 percent H5P3O10, 5 percent H3PO4, 2-3 percent H3P3O9, 3 percent polymer phosphoric acids and 2 percent H4P2O7;;

in neat (no solvent) thermal dehydration; formation of a sirupy liquid eqilibrium mixture of H3PO4, H4P2O7 and H5P3O10;;

in melt byproducts: polyphosphoric acid; formation of H3PO4, H5P3O10 and polyphosphoric acids in a melt of H4P2O7;;

in neat (no solvent) heating P2O5 with H3PO4; formation of a sirupy liquid eqilibrium mixture of H3PO4, H4P2O7 and H5P3O10;;

in water ion exchange (0°C, KU-2 cation exchange resin in H(1+) form); thin-layer chromy.;

in neat (no solvent) Kinetics; thermal dehydratation yields melt with equilibrium between H3PO4, H4P2O7 and HPO3, further dehydratation yields H5P3O10, H6P4O13 and higher polyphosphoric acids;;

water in water hydrolysis (pH 8-9) accelerated by hydroxides of La and Y, less accelerated by hydroxides of Mn, Fe, Al and Zn;;

water in water Kinetics; decompn. (0-50°C);