Given the two reactions 1. H2 S(aq) = HS-(aq)+ H+(aq), K1 = 9.38×10-8, and 2. HS (aq) = S²- (aq) +H†(aq), K2 = 1.16x10-19, what is the equilibrium constant Kfinal for the following reaction? S²-(aq) + 2H†(aq) = H2S(aq)

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