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Selenopentathionic Acid, H2SeS4O6

Selenopentathionic Acid, H2SeS4O6, is stated to be formed as the sodium salt when sodium thiosulphate and selenious acid interact in the presence of dilute hydrochloric acid. The reaction is described as taking place according to the equation

H2SeO3 + 4Na2S2O3 + 4HCl = Na2SeS4O6 + Na2S4O6 + 4NaCl + 3H2O,

but the result cannot be considered as absolutely proved, for the salt cannot be isolated, being decomposed when the solution is concentrated either by warming or in a vacuum.

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