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I know that we do not include solids and liquids when calculating the equilibrium constant because they do not have concentrations, but even if they do not have concentrations, don't they still affect the equilibrium?
A good example of this can be found in an example given during lecture in which we are required to find Kp for CaC03(s)-->/<-- CaO(s) +CO2(s). The ratio for the equilibrium constant would be Kp= P(partial pressure of)(CO2) because solids or liquids have such an irrelevant change in concentration that there is no point in adding them to the ratio for the Kp or Kc calculation.
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