The following equilibrium constants have been determined for hydrosulfuric acid at 25ºC: 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) ⇌ 2H+(aq)  +  S2–(aq)

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