Abstract
The reaction between phosphorous acid and permanganate exhibits a first-order dependence both on [MnVII] and [H3PO3] and the dependence of kobs. on [H+] is of the form (i) at constant ionic strength; kobs.=a+b[H+](i)kobs. is independent of ionic strength. The most probable mechanism in which the ‘inactive’ form of phosphorous acid, H–PO(OH)2, is the reactive species is discussed and the values of the rate-limiting constants together with their associated thermodynamic parameters are reported. The duality of H+ catalysis is also discussed in an alternative mechanism.
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