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- Chiara Frank
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Le Chatelier's Principle
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Postby Chiara Frank » Fri Jan 07, 2022 8:25 pm
Hi! I understand that the Le Chatelier's Principle refers to how chemical reactions adjust so as to minimize the effect of any changes. As a response in the reaction does not come from a change in pressure, but a change in concentration, would this principle not be applicable to changes in pressure? Or under certain conditions would it be applicable? Thank you!
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- Emma Goellner 2I
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Re: Le Chatelier's Principle
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Postby Emma Goellner 2I » Fri Jan 07, 2022 9:28 pm
Hi - it depends on how the pressure is changed. If the pressure is changed by changing the volume of the system, this will affect the value of K, and the reaction will adjust by shifting to the left or right accordingly (to minimize the effect of the change, as explained by Le Chatelier's Principle). However, if the pressure is changed by adding an inert gas, then the moles of reactant, product, and volume are constant. Therefore, there will be no affect on the reaction.
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- Jennifer Huynh 3I
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Re: Le Chatelier's Principle
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Postby Jennifer Huynh 3I » Fri Jan 07, 2022 9:37 pm
From my understanding, the principle does apply to changes in pressure, but only if the changes in pressure affect the concentration of the reactants or products.
Scenario 1:
Decreasing the volume of the reactants increases the pressure of the gases and increases the concentration of the gases (M = n/V). The increase in concentration will cause the reaction to shift to the right and produce more products. When the reaction reaches equilibrium again, K will be the same value as it was before the change in volume.
Scenario 2:
Increasing the pressure on the side of the reactants by adding an inert gas does not change the concentrations of the reactants or products, so there is no shift in the direction of the reaction and it remains at equilibrium.
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