Kinetics of pyroarsenate hydrolysis in aqueous solution
Keyword(s):
Ph Stat
◽
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 ΔH? = 49 � 9 kJ mol-1 and ΔS? = -107 � 30 J mol-1 K-1. An associative mechanism is indicated.
Keyword(s):
1987 ◽
Vol 52
(8)
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pp. 2005-2018
1986 ◽
Vol 51
(3)
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pp. 677-683
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1981 ◽
Vol 46
(5)
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pp. 1229-1236
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Keyword(s):
1990 ◽
Vol 55
(8)
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pp. 1984-1990
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Keyword(s):
1978 ◽
pp. 556-560
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Keyword(s):
1968 ◽
Vol 0
(0)
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pp. 167-169
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