The water activity of the H3AsO4.H2O system is quite important for controlling arsenic in the environment and modeling the hydrometallurgical processing related to arsenic. In this work, the water activity for this binary system, from extremely low concentrations to a molality of 18 mol*kg.1 at 298.15 K were determined by isopiestic measurements. The relative isopiestic molality deviation for parallel samples in each experimental run was better than 0.2 %. Combining these water activity data with the mean ionic activity coefficient ( m, a +- ) calculated by the Gibbs-Duhem equation, the Pitzer model parameters for arsenic acid aqueous solution were fitted. The reliability of the data and the model parameters obtained in this work were also systematically discussed.
Compounds
#
Formula
Name
1
AsH3O4
arsenic acid
2
H2O
water
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.