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The stability constants of gold(I) thiosulfate complexes have been determined by differential UV spectroscopy. The aqueous solutions contained 6 × 10−4 mol·dm−3 Na3Au(S2O3)2 and a variable amount of Na2S2O3 to vary the Au:S2O3 ratio over the range 1:5–1:200 and NaClO4 to maintain a constant ionic strength. The measurement of the absorbance of the solutions under investigation has been made in the...