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The ionic equation is 2K+(aq) + 2OH-(aq) + Co^2(aq) + 2Br^-(aq) ==> 2K+(aq) + 2Br-(aq) + Co(OH)2(s)
net ionic equation is Co2+(aq) + 2OH-(aq) ==> Co(OH)2(s)
So spectators are K+ and Br- ions.

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