Problem: Given that Kb for NH3 is 1.8x10-5 calculate Ka for NH4+ 

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We are asked to find Ka for NH4+. NH4+ is the conjugate acid of the weak base NH3

NH3              +     H2O      ⇌               NH4+     +     OH-
(weak base)              (acid)             (conjugate acid)     (conjugate base) 

Hence, the Ka of NH4+ can be calculated from the Kb of NH3. Ka and Kb are related by the autoionization constant of water (Kwby the following equation:

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Given that Kb for NH3 is 1.8x10-5 calculate Ka for NH4

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