Pressure change

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Hannah_1G
Posts: 100
Joined: Wed Sep 18, 2019 12:22 am

Pressure change

Postby Hannah_1G » Sun Feb 09, 2020 7:19 pm

How does pressure increasing or decreasing change the concentration of products or reactants in equilibrium? Does a change in pressure for a reactant affect another reactant in the reaction?

Sjeffrey_1C
Posts: 108
Joined: Wed Feb 20, 2019 12:17 am

Re: Pressure change

Postby Sjeffrey_1C » Sun Feb 09, 2020 7:22 pm

If pressure increases, according to Boyle's law, volume decreases. Thus, there would be more reactant per the amount of space, thus an increase in concentration.

AKhanna_3H
Posts: 104
Joined: Wed Sep 18, 2019 12:19 am

Re: Pressure change

Postby AKhanna_3H » Sun Feb 09, 2020 7:38 pm

Additionally, if the pressure increases the reaction will shift towards the side of the equation with less moles to counteract the change. If the pressure decreases the reaction will shift towards the side of the equation with more moles.

WesleyWu_1C
Posts: 117
Joined: Thu Jul 25, 2019 12:16 am

Re: Pressure change

Postby WesleyWu_1C » Sun Feb 09, 2020 9:09 pm

When a question tells you there s a change in pressure, you need to know more than that to see which side the reaction will shift to. If there was an increase in pressure because there was a decrease in volume, then the reaction favors the side with the fewer moles of gas. If there was an increase in pressure from adding an inert gas, the reaction will not favor any particular side because adding an inert gas doesn't change the concentration of any of the reactants or products.


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