Periodate species in aqueous solution

OXIDATION OF ORGANIC COMPOUNDS 1.2 PERIODATE SPECIES IN AQUEOUS SOLUTION 

Periodic acid has the following values at 25 °C p i = 1.64, p 2 = 8.31, pK = 12.2 (Buist et a/. ). The acid itself is present exclusively as HsIOs, but the monoanion H4IO6 is largely dehydrated to IO4, and the dianion undergoes dimerisation, viz. 

At 25 °C Ko — 40 (Crouthamel et al., and K, = 141 l.mole at an ionic strength of 0.1 (Buist et al. ). The measured first and second dissociation constants, Ki and K2, differ from the constants and K2 defined above, on account of the formation of IO4 

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