K value


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AMahadi
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Joined: Thu Jul 11, 2019 12:17 am

K value

Postby AMahadi » Thu Jan 09, 2020 2:22 pm

If the K value is large/small, what does that indicate about the product?

kim 2I
Posts: 105
Joined: Thu Jul 25, 2019 12:17 am

Re: K value

Postby kim 2I » Thu Jan 09, 2020 2:23 pm

If the K value is large (K>10^3), then it means there are more products at equilibrium and that the "equilibrium sits to the right."
If the K value is small (K<10^-3), then it means there are more reactants at equilibrium and that the "equilibrium sits to the left."

Connie Chen 1E
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

Re: K value

Postby Connie Chen 1E » Thu Jan 09, 2020 2:28 pm

If the K value is large (K>103), then the concentration of products is much greater than reactants at equilibrium. This means that the forward reaction is favored and more products are being produced than reactants.
If the K value is small (K<10-3), then the concentration of reactants is much greater than products at equilibrium. The reverse reaction is favored and more reactants are produced than products.
If the K value is in between 10-3 and 103, then neither the products nor reactants are strongly favored.

Cooper Baddley 1F
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Joined: Wed Sep 18, 2019 12:19 am

Re: K value

Postby Cooper Baddley 1F » Thu Jan 09, 2020 2:30 pm

The K value gives you the ratio of the products over the reactants so it being bigger or smaller tells you about the total concentration of each side of the ratio

805394719
Posts: 104
Joined: Wed Sep 11, 2019 12:16 am

Re: K value

Postby 805394719 » Thu Jan 09, 2020 2:37 pm

The K value is the equilibrium constant which is calculated by the concentration of the products divided by the concentration of the reactants at equilibrium. When the K value is large, this means that then the concentration of the products which is in the numerator is significantly larger than the concentration of the reactants which is in the denominator. This means that at equilibrium, the concentration of the products is greater than the concentration of the reactants, and so the reaction favors the products, so there will be more products at equilibrium. When the K value is small, this means that the reactants are favored, so there will be more reactants at equilibrium. Having the K value equal to 1 is rare. If the K value is equal to 1, neither the products nor the reactants are favored. The concentrations of the products and the reactants are equal at equilibrium.

pmokh14B
Posts: 107
Joined: Sat Aug 17, 2019 12:15 am

Re: K value

Postby pmokh14B » Thu Jan 09, 2020 2:46 pm

Larger K value indicates that there are more products at equilibrium, and smaller K value indicates that there are more reactants at equilibrium.

vanessas0123
Posts: 100
Joined: Wed Sep 11, 2019 12:17 am

Re: K value

Postby vanessas0123 » Thu Jan 09, 2020 3:13 pm

Large K value (K>10^3) means that there are more products @ eq and that the "equilibrium sits to the right."
Small K value (K<10^-3) means that there are more reactants @ eq and that the "equilibrium sits to the left."

905373636
Posts: 62
Joined: Thu Aug 01, 2019 12:15 am

Re: K value

Postby 905373636 » Thu Jan 09, 2020 3:59 pm

It's also important to remember that the significance of K is only considered strong when it is either >10^3 (strongly favor products) or <10^-3 (strongly favor reactants). Anything in between those two values still favors one side or the other (except for the rare circumstance at 1), but isn't considered strong.

Astrid Lunde 1I
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Joined: Sat Sep 07, 2019 12:16 am

Re: K value

Postby Astrid Lunde 1I » Thu Jan 09, 2020 4:47 pm

When K is a large value > 10^3 then there are more products at equilibrium. When K is a small value <10^-3 then there are more reactants.

Diana Andrade_4F
Posts: 50
Joined: Tue Nov 05, 2019 12:18 am

Re: K value

Postby Diana Andrade_4F » Thu Jan 09, 2020 10:23 pm

if K < 10^-3, then there are more reactants at equilibrium; this means that the equilibrium sits to the left.
if K > 10^3, then there are products at equilibrium; so equilibrium sits ti the right.
if K=1, the concentration of products and reactants are equal, so they have same stabilities.

Ying Yan 1F
Posts: 101
Joined: Fri Aug 02, 2019 12:16 am

Re: K value

Postby Ying Yan 1F » Fri Jan 10, 2020 5:32 pm

A large K value indicates that there are more prouducts present in the reaction while a small K value indicates that there are less product (and thus more reactant) present in the reaction.

Edmund Zhi 2B
Posts: 118
Joined: Sat Jul 20, 2019 12:16 am

Re: K value

Postby Edmund Zhi 2B » Fri Jan 10, 2020 5:41 pm

Another way to derive the meaning is to think about the actual formula of K, [products]/[reactants]. If K is high (greater than 10^3), this means that [products] is a greater value than [reactants] and thus a large K means that equilibrium lies on the right, the side of the products. Same concept applies for a small value of K, instead, equilibrium lies on the left. I feel like this is an easier way to understand the concept first before trying to memorize the values first

Robert Tran 1B
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Joined: Thu Jul 11, 2019 12:15 am

Re: K value

Postby Robert Tran 1B » Fri Jan 10, 2020 9:36 pm

If the K value is large, the reaction favors the products. On the other hand, if the K value is small, the reaction favors the reactants.

Tahlia Mullins
Posts: 105
Joined: Thu Jul 25, 2019 12:15 am

Re: K value

Postby Tahlia Mullins » Fri Jan 10, 2020 10:27 pm

A large K value indicates that the products of the reaction are more favorable and the reaction lies to the right, whereas a small K value indicates that the reactants are more favorable and the reaction lies to the left at equilibrium.

Anthony Hatashita 4H
Posts: 103
Joined: Wed Sep 18, 2019 12:21 am

Re: K value

Postby Anthony Hatashita 4H » Fri Jan 10, 2020 10:42 pm

Large K value means that the reaction shifts to the right, small K value means the opposite.


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