The absorption spectra in a large range of concentrations show that the reactions
of iodate with iodine in 96% sulfuric acid produce (IO) HSO4, I-3(+) and I-5(+), just
like in the pure 100% acid. We discovered that, in 96% H2SO4, these reactions also
produce I2O which is not formed in the pure acid. I2O is an important intermediate
of reactions in diluted sulfuric acid, including the Bray-Liebhafsky reaction, but
it had never been observed directly because of its very high reactivity. The equilibrium
constants of the reactions producing these four compounds were determined. (C) 2017
Elsevier B.V. All rights reserved.
