Volume and Le Chatelier's Principle

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Samantha Chang 2K
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Joined: Fri Sep 28, 2018 12:17 am

Volume and Le Chatelier's Principle

Postby Samantha Chang 2K » Wed Jan 23, 2019 8:14 pm

If there are the same number of moles on both sides of the equation and you increase/decrease the volume then does the equation shift to the left or right?

Irene Zhou 1E
Posts: 73
Joined: Fri Sep 28, 2018 12:18 am

Re: Volume and Le Chatelier's Principle

Postby Irene Zhou 1E » Wed Jan 23, 2019 8:15 pm

If there are the same number of gas moles on both sides of the equation, then the reaction would not shift to favor either direction.

Anushi Patel 1J
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Re: Volume and Le Chatelier's Principle

Postby Anushi Patel 1J » Wed Jan 23, 2019 9:10 pm

Just to add on, it's because the concentrations of all the reactants and products increase proportionally when you change the volume if there is an equal number of moles on both side, so the equilibrium stays the same.

Angela Grant 1D
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Joined: Fri Sep 28, 2018 12:25 am

Re: Volume and Le Chatelier's Principle

Postby Angela Grant 1D » Wed Jan 23, 2019 10:18 pm

Minimizing the effect of changing volume is dependent on what side has more moles, so if both sides are the same then there's no shift that will minimize the effect. Aka it doesn't shift left or right

sophiebillings1E
Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

Re: Volume and Le Chatelier's Principle

Postby sophiebillings1E » Wed Jan 23, 2019 10:42 pm

If an inert gas is added to the system the reaction does not shift one way or the other

gwynlu1L
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: Volume and Le Chatelier's Principle

Postby gwynlu1L » Thu Jan 24, 2019 2:40 am

To understand why by changing the volume, if the number of moles is different between reactants and products thus shifting the reaction left or right, you have to understand that volume and pressure are inversely related. You increase the volume, the pressure will decrease. So, in this circumstance, this change in volume will favor the side with more moles, bc the reaction will want to compensate for the loss in pressure by creating more moles of gas. On the other hand, if you decrease the volume, the pressure will increase, so the rxn will favor the side with less moles bc the rxn will want to compensate for the increase in pressure by making less moles.


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