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Changing the pressure of a container by decreasing or increasing its volume does not affect K. This is because the partial pressures of all the gases involved in calculating K change by a common factor when a gas is compressed or otherwise, therefore the overall ratio of products to reactants remains the same.
Changes in pressure do not affect K as Dr. Lavelle mentioned in class. Adding an inert gas to increase pressure does not affect the moles of the reactant or product and the volume remains constant. Similarly, changes in volume also do not affect K as the system will try to restore equilibrium through Le Chatelier's Principle.
Changes in pressure or volume cause changes in concentration (due to PV=nRT), and changes in concentration don't affect K due to Le Chatelier's Principle, so that's why pressure and volume don't affect K, only temperature.
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