Answer
See explanation below.
Work Step by Step
Autoionization reaction is a reaction that occurs when a proton is transferred from one molecule to another molecule of the same substance.
These are the autoionization for Kc and So Kw:
Kc= [H3O+][OH-][H2O]^2
So Kw=[H2O]^2 and Kc= [H3O][OH-]