Problem: If two reactions sum to an overall reaction, and the equilibrium constants for the two reactions are K1 and K2, what is the equilibrium constant for the overall reaction?

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We're asked to determine the equilibrium constant, K of the overall reaction given that the equilibrium constants for the two reactions (individual steps) are K1 and K2.


Recall that using Hess’s Lawwe can calculate the equilibrium constant, K of an overall reaction which is the sum of individual steps. 

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If two reactions sum to an overall reaction, and the equilibrium constants for the two reactions are K1 and K2, what is the equilibrium constant for the overall reaction?