
TY  - JOUR
A1  - Richmond, TG 
A1  - Johnson, JR 
A1  - Edwards, JO 
A1  - Rieger, PH 
T1  - Kinetics of pyroarsenate hydrolysis in aqueous solution
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1977
VL  - 30
IS  - 6
SP  - 1187
EP  - 1194
KW  - 
UR  - https://doi.org/10.1071/CH9771187 
N2  - The rate of hydrolysis of pyroarsenate in 0.1 mol dm-3 NaClO4 solutions, pH 6-9, was measured by a pH-stat technique at temperatures ranging from 278 to 298 K. The pKa of HAs2O73-, found to be the predominant reactant under these conditions, was 7.3 and 7.6 at 283 and 298 K, respectively. The hydrolysis rate constant for HAs2O73- was 0.05 s-1 at 298 K with activation parameters &#916;H? = 49 ± 9 kJ mol-1 and &#916;S? = -107 ± 30 J mol-1 K-1. An associative mechanism is indicated. 
ER  -

