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Solving Example Equilibium Equations

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In order to do the following problem, do I subtract the Kc from each other?

The following equilibrium constants have been determined for hydrosulfuric acid at 25°C.
H2S(aq) = H+(aq) + HS -(aq) K'c = 9.5 10-8
HS -(aq) = H+(aq) + S2-(aq) K"c = 1.0 10-19

Calculate the equilibrium constant for the following reaction at the same temperature.
H2S(aq) = 2 H+(aq) + S2-(aq)

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