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K value

Posted: Thu Jan 09, 2020 2:22 pm
If the K value is large/small, what does that indicate about the product?

Re: K value

Posted: 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."

Re: K value

Posted: 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.

Re: K value

Posted: 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

Re: K value

Posted: 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.

Re: K value

Posted: 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.

Re: K value

Posted: 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."

Re: K value

Posted: 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.

Re: K value

Posted: 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.

Re: K value

Posted: 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.

Re: K value

Posted: 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.

Re: K value

Posted: 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

Re: K value

Posted: 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.

Re: K value

Posted: 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.

Re: K value

Posted: Fri Jan 10, 2020 10:42 pm
Large K value means that the reaction shifts to the right, small K value means the opposite.