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We are asked to find Ka for (CH3)3NH+. (CH3)3NH+ is the conjugate acid of the weak base (CH3)3NH.
(CH3)3NH + H2O ⇌ (CH3)3NH+ + OH-
(weak base) (acid) (conjugate acid) (conjugate base)
Hence, the Ka of (CH3)3NH+ can be calculated from the Kb of (CH3)3NH. Ka and Kb are connected by the autoionization constant of water (Kw) by the following equation:
Given that Kb for (CH3)3N is 6.3 × 10-5 at 25°C, what is the value of Ka for (CH3)3NH+ at 25 °C?
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