HELP ME with Ka value! =(?

Given Ka values of 5.6 x 10-10 and 4.8 x 10-10 for NH4+ and HCN respectively, calculate the equilibrium constant for the following reaction.


NH4+ + CN- <-------> NH3 + HCN

Answer:
Since you have essentially added the two equilibriums to make one new equilibrium, you just multiply the Ka and Kb which you are given - that should give you the K for the resultant reaction. So that is K = 5.6 *10^-10 * 4.8 * 10^-10

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