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what is Kc at 25 celsius for the following equilibrium?

CH3BH3^+ +H2O <==> CH3NH2 + H3O^+
Kb=4.4x10^-4
I got 4.0x10^4 / 1.0x10^-14 = 4.0x10^-10 (correct)?

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No but almost. Divide the other way or take the reciprocal of your answer.

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