Question

Using the following reaction: Ag+ (aq) + 2S2O3 2- (aq) <--> Ag(S2O3)2 3- (aq) , where...

Using the following reaction:

Ag+ (aq) + 2S2O3 2- (aq) <--> Ag(S2O3)2 3- (aq) , where Kf= 5*10^13

What is the ratio of [Ag+] to [Ag(S2O3)2^3-] in a bath in which [S2O3^2-] = 0.230?

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Answer #1

Kf = [Ag(S2O3)23-] / ([Ag+][ S2O3 2-]2) = 5x1013

[Ag+]/[Ag(S2O3)2^3-] = 1/(Kf x[ S2O3 2-]2) =

                                      = 1/ (5x1013 x 0.2302) =

                                      = 3.78x10-13

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