Abstract
It is possible to initiate an oxidation reaction in a solution of hydroxylamine and sodium thiocyanate in aqueous nitric acid in a spectrophotometer cell at the meniscus. The thiocyanate and hydroxylamine are oxidised, and nitric acid is reduced to nitrous acid. A narrow well-defined reaction zone develops which then moves at a constant rate downwards through the solution. One of the reaction intermediates, nitrosyl thiocyanate, absorbs at 460 nm so the reaction zone is coloured red and is easily observed. The distribution of nitrosyl thiocyanate within the reaction zone has been studied.
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