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find the concentration of h3o in a .86mol/l solution of the weak acid H2O2 (kA=2.4x10-12)

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.......H2O2 ==> H^+ + HO2^-
I.....0.86......0......0
C......-x.......x......x
E...0.86-x......x......x

Substitute the E line into the Ka expression and solve for x = (H3O^+).

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