Reaction Direction

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Jarrett Peyrefitte 2K
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

Reaction Direction

Postby Jarrett Peyrefitte 2K » Wed Jan 08, 2020 2:17 pm

How do you determine what direction of the reaction goes given K and the concentrations of all reactants and products?

Esha Chawla 2E
Posts: 108
Joined: Thu Jul 25, 2019 12:17 am

Re: Reaction Direction

Postby Esha Chawla 2E » Wed Jan 08, 2020 2:28 pm

Jarrett Peyrefitte 2K wrote:How do you determine what direction of the reaction goes given K and the concentrations of all reactants and products?


Using the concentrations of all reactants and products, find Qc. Then, compare Qc to K. If Q < K, then the products are favored and the reaction proceeds forward. If Q > K, then the reactants are favored and the reaction proceeds backward. If Q = K, then the reaction is at equilibrium.

Aman Sankineni 2L
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Joined: Fri Aug 30, 2019 12:17 am

Re: Reaction Direction

Postby Aman Sankineni 2L » Wed Jan 08, 2020 5:25 pm

Q, which is the reactant quotient, is used to identify the direction of the reaction. By comparing the Q value, which is found with the same equation as the K value, with the K value, you can identify the direction. If Q < K then the reaction proceeds forwards but if Q > K then the reverse reaction proceeds. If Q=K then the reaction is already at equilibrium.

Harry Zhang 1B
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Joined: Sat Sep 14, 2019 12:16 am

Re: Reaction Direction

Postby Harry Zhang 1B » Wed Jan 08, 2020 7:14 pm

You can determine the direction that a reaction goes to by looking at the Q and K value. If the Q value is smaller than the K value, then in order for the reaction to reach K, or equilibrium, there needs to be more products, and if the Q is larger than the K value, there needs to be more reactants for the reaction to approach equilibrium.

Emily Vainberg 1D
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Joined: Sat Jul 20, 2019 12:15 am

Re: Reaction Direction

Postby Emily Vainberg 1D » Wed Jan 08, 2020 11:05 pm

You use Q, which the the reactant quotient. You calculate it the same way as you find K (concentration of product/concentration of reactants). If Q<K the reaction proceeds to the right because the forward reaction is favored. If Q>K the reverse reaction is favored, so reaction proceeds to the left. Q=K means the reaction is at equilibrium.

BritneyP- 2c
Posts: 101
Joined: Sat Sep 14, 2019 12:15 am

Re: Reaction Direction

Postby BritneyP- 2c » Wed Jan 08, 2020 11:38 pm

You use the Q to find whether the reaction is reactant favored or product favored. By using the concentrations of the compounds, if Q<K then it is reactant favored and the forward reaction is favored. If Q>K then it is product favored and the reverse reaction is favored.


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