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Consider the following general reaction (acetic acid + water in equilibrium with hydronium + acetate):

HC2H3O(aq)  + H2(l)  ? H3O+ (aq) + C2H3O2- (aq)   Kc = 1.8 x 10-5 (at 25 ºC)

If a solution initially contains (5.6x10^-1) M of HC2H3O2, (and no H3Oor C2H3O2),what is the equilibrium concentration of H3O+ (aq) in the mixture?

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