pressure

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Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

pressure

Postby Katie Bart 1I » Tue Jan 14, 2020 4:26 pm

When does pressure affect the reactants/products of a reaction at equilibrium? Does it depend on the type of gas?

Ally Huang- 1F
Posts: 103
Joined: Thu Jul 25, 2019 12:16 am

Re: pressure

Postby Ally Huang- 1F » Tue Jan 14, 2020 4:40 pm

When the pressure of the system decreases the reaction goes toward the side with more moles to restore equilibrium in the system. If the pressure of the system increases the reaction will favor the direction with fewer moles. Any inert gas will not change the reactant and product concentrations and will have no effect on equilibrium.

BNgo_2L
Posts: 95
Joined: Wed Sep 11, 2019 12:17 am

Re: pressure

Postby BNgo_2L » Tue Jan 14, 2020 4:56 pm

Pressure only affects reactants and products when decreasing/increasing volume is involved. Decreasing the volume will increase the concentration of the gases in which [reactants]>[products] while increasing the volume will decrease the concentration of the gases in which [reactants]<[products]. When you're changing only pressure (without involving volume/concentration), the reactant and products are not affected.

Tyler Angtuaco 1G
Posts: 130
Joined: Wed Sep 11, 2019 12:16 am

Re: pressure

Postby Tyler Angtuaco 1G » Wed Jan 15, 2020 9:00 pm

Pressure happens to be one of the parameters that affects the rate of reactions. When pressure is altered, the reaction will proceed to the side with less moles of gas. This observation can be derived by first considering the inverse relationship between pressure and volume (which affects concentration as shown by the ideal gas law) and then calculating the reaction quotient, Q.

Verity Lai 2K
Posts: 100
Joined: Sat Aug 24, 2019 12:18 am

Re: pressure

Postby Verity Lai 2K » Wed Jan 15, 2020 10:15 pm

If you increase the pressure, often times by decreasing the volume, the reaction will go to the side that has fewer moles and if you decrease the pressure, by increasing the volume, it will go towards the side with more moles. If they has an equal amount of moles on each side, it should remain the same. Also if you add inert gas to a reaction vessel (ie noble gases, non reactive gases), the reaction won’t be effected despite if seeming like the pressure is increasing.

Ruby Richter 2L
Posts: 103
Joined: Thu Jul 25, 2019 12:17 am

Re: pressure

Postby Ruby Richter 2L » Thu Jan 16, 2020 4:45 pm

Ally Huang- 1F wrote:When the pressure of the system decreases the reaction goes toward the side with more moles to restore equilibrium in the system. If the pressure of the system increases the reaction will favor the direction with fewer moles. Any inert gas will not change the reactant and product concentrations and will have no effect on equilibrium.

Why does inert gas not change the reactant and product concentrations and have no effect on the equilibrium?


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