ISSN:
1572-901X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary The kinetics of the anation reaction of [Co(NH3)5H2O]3+ by H3PO3/H2PO 3 − , to give [CoH2PO3(NH3)5]2+, have been studied at 60, 70 and 80°C, in the acidity range [H+](M)=1.5 · 10−1 −2.0 · 10−3. Only H2PO3 is found to be reactive. The rate data is consistent with an Id mechanism. The mean value of outer sphere association of [Co(NH3)H2O]3+ with H2PO 3 − is 1.5 M−1. Values of the interchange constants are: 1044ki(s−1)= 0.29, 1.47, 5.13, at 60, 70 and 80 °C respectively (ΔH≠= 1.4 · 102KJmol−1, ΔS≠=8.3 · 10 JK−1 mol−1). The first acidity constant of H3PO3 at I=1.0 has also been determined: 102Ka(M)=4.8, 5.2 and 5.5, at 25, 40 and 50 °C respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00637027
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