Equilibrium constant v. Reaction quotient

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peteryim
Posts: 54
Joined: Sat Sep 07, 2019 12:17 am

Equilibrium constant v. Reaction quotient

Postby peteryim » Mon Jan 06, 2020 7:13 pm

What exactly is the difference between an equilibrium constant and a reaction quotient? The textbook said that the reaction quotient can be used for any stage of the reaction, and it accounts for free energy, but I am confused as to how exactly it does this.

Benjamin Feng 1B
Posts: 102
Joined: Sat Sep 07, 2019 12:19 am

Re: Equilibrium constant v. Reaction quotient

Postby Benjamin Feng 1B » Mon Jan 06, 2020 8:11 pm

Equilibrium constant is the value only when the reaction is at equilibrium and will be constant given fixed conditions. Reaction quotient is the value at any time and the value varies depending on the concentrations.

anjali41
Posts: 109
Joined: Fri Aug 09, 2019 12:15 am

Re: Equilibrium constant v. Reaction quotient

Postby anjali41 » Mon Jan 06, 2020 8:18 pm

Both are found using the same equation, but they differ because the reaction quotient is not specifically limited to equilibrium.

Lindsey Chheng 1E
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

Re: Equilibrium constant v. Reaction quotient

Postby Lindsey Chheng 1E » Mon Jan 06, 2020 9:24 pm

peteryim wrote:What exactly is the difference between an equilibrium constant and a reaction quotient? The textbook said that the reaction quotient can be used for any stage of the reaction, and it accounts for free energy, but I am confused as to how exactly it does this.

K is a ratio solved with values at equilibrium. Since Q is a ratio solved for a system that is not at equilibrium, it can help us predict which direction the reaction will shift to establish equilibrium.


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