Sodium thiosulfate can remove crystals of AgBr from black-and-white photographic film by reacting the AgBr with sodium thiosulfate. AgBr(s) + 2 S2032-(aq) --> [Ag(S203)2]3– (aq) + Br-(aq) What is the equilibrium constant for this dissolving process? The solubility product constant of silver bromide is 5.35 cross times 10-13 and the formation constant of dithiosulfatoargentate(l) is 1.7 cross times 1013. How many moles of Na2S2O3 must Greg add to 200.0 mL of solution to dissolve 0.667 g of AgBr?

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