Question

Potassium ferrocyanide reaction with hydrogen peroxide

Answer 1

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The dark reaction between hydrogen peroxide and a pure dilute aqueous solution of potassium ferrocyanide has been critically examined. The experiments described in the paper lead to the conclusion that potassium aquopentacyanoferrite produced as a substitution product in very minute concentration in aqueous ferrocyanide in the dark reacts with hydrogen peroxide resulting in the measured dark reaction. Aged solutions of ferrocyanide, as well as pre-heated and pre-illuminated solutions used sometime after treatment show a distinctly lower rate of peroxide decomposition. This diminished reactivity towards hydrogen peroxide appears to be due to the partial decomposition of the aquo-complex salt by heat, prolonged exposure to light and ageing.


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Answer 2

The dark reaction between hydrogen peroxide and a pure dilute aqueous solution of potassium ferrocyanide has been critically examined. The experiments described in the paper lead to the conclusion that potassium aquopentacyanoferrite produced as a substitution product in very minute concentration in aqueous ferrocyanide in the dark reacts with hydrogen peroxide resulting in the measured dark reaction. Aged solutions of ferrocyanide, as well as pre-heated and pre-illuminated solutions used sometime after treatment show a distinctly lower rate of peroxide decomposition. This diminished reactivity towards hydrogen peroxide appears to be due to the partial decomposition of the aquo-complex salt by heat, prolonged exposure to light and ageing.