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We ignore the terms that are solids when calculating the equilibrium constant because solids do not have concentration. Since it does not have a concentration, it can not be implemented in solving for the Reaction Quotient, Q, or Equilibrium constant, K.
My TA said that the activity of solids and liquids are essentially equal to 1, so when calculating the equilibrium constant solids and liquids do not matter because all the units are essentially dealing with the activity of a species.
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