Reaction Quotient

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Samantha Chung 4I
Posts: 77
Joined: Wed Oct 03, 2018 12:16 am

Reaction Quotient

Postby Samantha Chung 4I » Wed Jan 09, 2019 8:57 am

As I was completing the reading section, I noticed that there was a "reaction quotient" - what is the difference between this sand the K value?

Emma Scholes 1L
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am

Re: Reaction Quotient

Postby Emma Scholes 1L » Wed Jan 09, 2019 10:08 am

K is used to describe a reaction at equilibrium. The reaction quotient is used to describe a reaction that is not at equilibrium. If the reaction quotient is equal to K, you know that the reaction is at equilibrium.

Becky Belisle 1A
Posts: 81
Joined: Fri Sep 28, 2018 12:18 am

Re: Reaction Quotient

Postby Becky Belisle 1A » Wed Jan 09, 2019 10:21 am

The reaction quotient still has the same formula as the equilibirum constant, except for the equilibrium constant the values used are the ones at equilibrium.

Chris Freking 2G
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Reaction Quotient

Postby Chris Freking 2G » Wed Jan 09, 2019 2:20 pm

K refers to the [P]/[R] ratio at equilibrium. Although Q also refers to the [P]/[R] ratio, it can be measured at any point in time in a reaction--including equilibrium.
If Q<K, then the forward reaction (products forming) is favored.
If Q>K, then the reverse reaction (reactants forming) is favored.
If Q=K, then the reaction is at equilibrium and reactants and products are being formed at equal rates.

megan blatt 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

Re: Reaction Quotient

Postby megan blatt 2B » Wed Jan 09, 2019 8:24 pm

Going off of the previous comments, Q is the reaction quotient which is calculated the same way that K is. However, K is used once the reaction has reached equilibrium while Q is used for any other point in the reaction while it is reaching equilibrium.

Jonny Schindler 1A
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: Reaction Quotient

Postby Jonny Schindler 1A » Thu Jan 10, 2019 11:29 am

Both K and Q represent the ratio of products to reactants, but using Q implies that the reaction is not at equilibrium and the ratio will shift until equilibrium is reached. At this point, the ratio is represented as K


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