Abstract
NEUTRAL solutions of K4Fe(CN)6 have been known to become alkaline when irradiated by ultra-violet light1–3. It has been suggested that photolysis of Fe(CN)6−4 first takes place to give Fe(CN)6−3 and (CN)−1, and the latter then hydrolyses, producing free alkali: When the light source is cut off, all the three reactions are reversed and the original pH is restored unless irradiation has been far too prolonged2.
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MITRA, R., JAIN, D., BANNERJEE, A. et al. Role of Free Radicals in the Photo-oxidation of Fe+2 in Acidic Solutions of Ferrocyanide. Nature 200, 163–164 (1963). https://doi.org/10.1038/200163a0
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DOI: https://doi.org/10.1038/200163a0
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