Hydrolysis of potassium periodate: ultracentrifugation, potentiometric titration, and Raman spectra

Abstract

Equilibrium ultracentrifugations, potentiometric acidity measurements, and Raman spectra of hydrolysed potassium periodate solutions have been interpreted by assuming the species IO₄^–, H₂I₂O₁₀^4–, H₃IO₆^2–, and H₂IO₆^3–. The least-squares refined formation constants in 0·5M-potassium chloride at 25° are: 2IO₄^–+ 2OH^–=H₂I₂O₁₀^4–, log β_2,2= 15·05 ± 0·03; IO₄^–+ OH^–+ H₂O = H₃IO₆^2–, log β_1,1= 6·21 ± 0·02; and IO₄^–+ 2OH^–= H₂IO₆^3–, log β_2,1= 8·67 ± 0·01