What reactions occur when determining the concentration of sodium thiosulfate?

When establishing the exact concentration of sodium thiosulfate, the following reactions occur:
К2Сг2О7 + 6KJ + 7H2SO4 = Cr2 (SO4) 3 + 3 J2 + 4K2SO4 + 7H2O,
J2 +2 Na2S2O3 = 2NaJ + Na2S4O6

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