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EC number: 233-666-8
CAS number: 10294-66-3
Thiosulfates are known to be stable under alkaline conditions, but not in acidic media. In aqueous media, thiosulfates irreversibly disproportionate to sulfite and sulfate anions.
Thiosulfates are known to be stable
under alkaline conditions, but not in acidic media. Thiosulfates
disproportionate in aqueous solution to form polythionic acids and SO2(HSO3-),
this requires somewhat different, more acidic conditions. 
+ SO2+ H2O
one key study (Lange, 2011) demonstrated that sodium thiosulfate is
stable at pH 4, 7 and 9 with an estimated half-life of >1 year at
Wiberg, Lehrbuch der Anorganischen Chemie, 101. Auflage
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