Calculate the acid dissociation constant,Ka,for the ammonium ion NH4+ .

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Explanation: 

Kb for NH3 is listed in the table as Kb = 1.8 x 10-5 . Using the equation we can calculate Ka for the conjugate acid NH4+ :

Ka = Kw / Kb = 1.0 x 10^-14 / 1.8 x 10^-5 = 5.6 x 10^-10 

Answer: 

5.6 x 10^-10