Q=K

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briannam_1F
Posts: 17
Joined: Wed Sep 18, 2019 12:18 am

Q=K

Postby briannam_1F » Sun Jan 12, 2020 11:50 pm

I'm confused has to why Q=K when Q is supposed to representative of a system that has not yet reached equilibrium?

lilymayek_1E
Posts: 86
Joined: Sat Aug 17, 2019 12:16 am

Re: Q=K

Postby lilymayek_1E » Mon Jan 13, 2020 12:27 am

Q is representative of a chemical system's direction towards products/reactants at any given moment; so it can represent a system out of equilibrium or possibly a system in equilibrium at a very specific moment. Q can equal K in a given moment in time during a chemical reaction; it simply means that in that specific moment during the reaction, Q=K and the reaction favors neither reactants or products and is in an equilibria state.

christabellej 1F
Posts: 93
Joined: Sat Aug 17, 2019 12:17 am

Re: Q=K

Postby christabellej 1F » Mon Jan 13, 2020 8:46 am

Q can be calculated at any point during the reaction, whether the reaction is at equilibrium or not. As such, the value of Q could indicate that a reaction is not yet at equilibrium (such as Q<K or Q>K) or that it is at equilibrium (Q=K).

Aarushi Solanki 4F
Posts: 86
Joined: Sat Jul 20, 2019 12:17 am

Re: Q=K

Postby Aarushi Solanki 4F » Mon Jan 13, 2020 9:01 am

K is the equilibrium constant, and a reaction naturally shifts with the goal of reaching equilibrium. So, although Q is representative of the actual system, the ideal state is Q=K.

Keerthana Sivathasan 2E
Posts: 85
Joined: Wed Sep 18, 2019 12:22 am

Re: Q=K

Postby Keerthana Sivathasan 2E » Mon Jan 13, 2020 9:27 am

Q can only be equal to K when the reaction is at equilibrium. Q is just used to check to see if a reaction is at equilibrium if you are unsure. If Q is less than K, that means there is more reactants than products, so the reaction is still going to the right, while if Q is more than K, that means there is more products than reactants, and so the reaction should be proceeding to the left.

Sam McNeill 1E
Posts: 94
Joined: Sat Aug 24, 2019 12:17 am

Re: Q=K

Postby Sam McNeill 1E » Mon Jan 13, 2020 10:25 am

Q is calculated the exact same way as K, it is simply just used to determine if more products or more reactants need to be made in order to reach equilibrium.

805097738
Posts: 149
Joined: Wed Sep 18, 2019 12:20 am

Re: Q=K

Postby 805097738 » Mon Jan 13, 2020 12:24 pm

Q doesn't have to be strictly not at equilibrium. It can be at any point in the reaction including equilibrium, K.

105335337
Posts: 87
Joined: Sat Aug 24, 2019 12:15 am

Re: Q=K

Postby 105335337 » Mon Jan 13, 2020 12:26 pm

Q is just the system quotient at any time. If q ends up equaling K that means that the reaction is at equilibrium. If K>Q the forward reaction is favored & if K<Q then the backwards reaction is favored.

pmokh14B
Posts: 92
Joined: Sat Aug 17, 2019 12:15 am

Re: Q=K

Postby pmokh14B » Mon Jan 13, 2020 12:27 pm

When Q equals K the system is at equilibrium. In all other situations, it is not.

Kallista McCarty 1C
Posts: 175
Joined: Wed Sep 18, 2019 12:18 am

Re: Q=K

Postby Kallista McCarty 1C » Mon Jan 13, 2020 1:44 pm

When Q=K the reaction is at equilibrium. When Q<K the forward reaction is favored and when Q>K the reverse reaction is favored.

sarahsalama2E
Posts: 143
Joined: Fri Aug 30, 2019 12:16 am

Re: Q=K

Postby sarahsalama2E » Mon Jan 13, 2020 2:03 pm

Q is calculated the same way as k. If Q is less than K than the reaction proceeds forwards and vice versa if its the opposite.

vanessas0123
Posts: 78
Joined: Wed Sep 11, 2019 12:17 am

Re: Q=K

Postby vanessas0123 » Tue Jan 14, 2020 12:20 pm

Q can be calculated at any point during the reaction, including the equilibrium point. Thus, if Q = K, that means that the reaction is at equilibrium.

BCaballero_4F
Posts: 79
Joined: Wed Nov 14, 2018 12:22 am

Re: Q=K

Postby BCaballero_4F » Wed Jan 15, 2020 12:59 am

Q can be calculated at any given moment, not only when the system is not at equilibrium, so Q=K is when Q is calculated when it is at equilibrium.

Jasmine Vallarta 2L
Posts: 89
Joined: Sat Aug 17, 2019 12:18 am

Re: Q=K

Postby Jasmine Vallarta 2L » Wed Jan 15, 2020 9:23 am

If you're unsure whether a rxn has reached equilibrium, you have to use Q. If you know the K value and it matches Q, then you know that the rxn has reached equilibrium

Nathan Nakaguchi 1G
Posts: 86
Joined: Wed Sep 18, 2019 12:22 am
Been upvoted: 1 time

Re: Q=K

Postby Nathan Nakaguchi 1G » Wed Jan 15, 2020 10:01 am

Q can be calculated at any time (including when it has already reached equilibrium) during the reaction and is compared to K to see the direction of the reaction, if Q equals K then that just means the reaction is at equilibrium.


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