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In an experiment, equal volumes of 0.00200M FeCl3 and 0.00200M NaSCN were mixed together and reacted according to the equation: Fe^3+(aq) + SCN^-(aq) <--> FeSCN^2+(aq) The equilibrium concentration of FeSCN^2+(aq) was 2.70*10^-4M.
Calculate the equilibrium constant for the reaction

 

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