V-51 NMR studies on the chemical equilibria of vanadium(5+) species we
re made for aqueous solutions of low ionic strength and pH values rang
ing from 2.0 to 12.0. The average charge per V atom of these ionic spe
cies is from +1 to -2, and the measurements were made at temperatures
of 0, 25, and 50 degrees C. Analysis of these results gave accurate th
ermochemical values for the following major constituent ions of these
solutions: VO2+, H2VO4-, HVO42-, H2V2O72-, HV2O73-, V2O74-, V4O124-, a
nd HV10O285-.