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Solids are not factored into equilibrium constant calculations because of the nature of how the equilibrium constant is calculated and the nature of solids themselves. To calculate the equilibrium constant, the concentration of products is divided by the concentration of reactants. Solids themselves can not have concentrations because a concentration is moles of solute per liter of solution. There is no solution for a solid, meaning there can be no concentration of solids. Due to this, solids are not factored into the equilibrium constant calculation.
Solids have an essentially constant concentration because they are practically incompressible. As a result, it takes enormous pressure to cause even a tiny reduction in volume. As such, solids can be excluded from the equilibrium constant.
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