Small K value and Large K value

Moderators: Chem_Mod, Chem_Admin

WYacob_2C
Posts: 82
Joined: Sat Jul 20, 2019 12:16 am

Small K value and Large K value

Postby WYacob_2C » Wed Jan 08, 2020 12:35 pm

What is the cut off for the value of K to say that the reaction strongly favors the formation of reactions and the reaction strongly favors the formation of products? Thank you in advance.

Rachel Yu 1G
Posts: 94
Joined: Fri Aug 09, 2019 12:15 am

Re: Small K value and Large K value

Postby Rachel Yu 1G » Wed Jan 08, 2020 1:38 pm

K >10^3 means that the reaction strongly favors the formation of products.
K < 10^-3 means that the reaction strongly favors the formation of reactants
10^-3 < K < 10^3 means that the reaction is not reactant or product favored.

Shannon Asay 1C
Posts: 82
Joined: Fri Aug 09, 2019 12:16 am

Re: Small K value and Large K value

Postby Shannon Asay 1C » Wed Jan 08, 2020 1:39 pm

It strongly favors the formation of products if K>10^3 and it strongly favors the formation of reactants when K<10^-3.

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

Re: Small K value and Large K value

Postby sarahsalama2E » Wed Jan 08, 2020 2:07 pm

Additionally, it's very rare that k=1 because that would mean that the two compounds which are different have the same stability.

Esha Chawla 2E
Posts: 88
Joined: Thu Jul 25, 2019 12:17 am

Re: Small K value and Large K value

Postby Esha Chawla 2E » Wed Jan 08, 2020 2:32 pm

WYacob_2C wrote:What is the cut off for the value of K to say that the reaction strongly favors the formation of reactions and the reaction strongly favors the formation of products? Thank you in advance.


Dr. Lavelle said that the cutoff is 10^-3 and 10^3 respectively. Thus, if K < 10^-3, then the reactants are strongly favored. On the other hand, if K > 10^3, then the products are strongly favored. If K = 1 (this is extremely rare), then neither reactants nor products are favored, as they have the same level of stability. Finally if 10^-3<K<10^3, then reactants or products may slightly be favored in one direction or the other, but not by a significant amount

Elizabeth Harty 1A
Posts: 101
Joined: Sat Jul 20, 2019 12:16 am

Re: Small K value and Large K value

Postby Elizabeth Harty 1A » Wed Jan 08, 2020 3:06 pm

In lecture, Lavelle said that if the value is between the two limits neither the reactant nor the product is favored and it is in a sort of intermediate state.

Michellekim1H
Posts: 25
Joined: Wed Feb 20, 2019 12:17 am

Re: Small K value and Large K value

Postby Michellekim1H » Wed Jan 08, 2020 4:10 pm

Because K= Products/Reactants, when K > 10^3, this means that products are being favored since K would be large(thus, shifting to the right). When K<10^-3, the reaction favors reactants because K would be small(shifting to the left).

Abby Soriano 1J
Posts: 83
Joined: Sat Aug 24, 2019 12:16 am

Re: Small K value and Large K value

Postby Abby Soriano 1J » Wed Jan 08, 2020 5:11 pm

Elizabeth Harty 1A wrote:In lecture, Lavelle said that if the value is between the two limits neither the reactant nor the product is favored and it is in a sort of intermediate state.


Does that mean that we most likely won't be asked a question on whether the reactants or products are favored if the K value falls between either 10^-3 and 10^3?

Matthew Tsai 2H
Posts: 85
Joined: Wed Sep 18, 2019 12:20 am

Re: Small K value and Large K value

Postby Matthew Tsai 2H » Wed Jan 08, 2020 7:11 pm

Abby Soriano 1J wrote:
Elizabeth Harty 1A wrote:In lecture, Lavelle said that if the value is between the two limits neither the reactant nor the product is favored and it is in a sort of intermediate state.


Does that mean that we most likely won't be asked a question on whether the reactants or products are favored if the K value falls between either 10^-3 and 10^3?


I think there could be cases where K is between 10^-3 and 10^3, in which technically neither the forward nor reverse reaction would be favored.

Alexandra Bartolome 2H
Posts: 82
Joined: Sat Jul 20, 2019 12:17 am

Re: Small K value and Large K value

Postby Alexandra Bartolome 2H » Wed Jan 08, 2020 9:13 pm

Abby Soriano 1J wrote:
Elizabeth Harty 1A wrote:In lecture, Lavelle said that if the value is between the two limits neither the reactant nor the product is favored and it is in a sort of intermediate state.


Does that mean that we most likely won't be asked a question on whether the reactants or products are favored if the K value falls between either 10^-3 and 10^3?


I think we could still be asked a question like this where the K value falls between that range, the answer could just be that it is in an intermediate state and does not favor either the reactants or products.

Mandeep Garcha 2H
Posts: 85
Joined: Sat Aug 24, 2019 12:17 am

Re: Small K value and Large K value

Postby Mandeep Garcha 2H » Thu Jan 09, 2020 6:05 pm

This image helped to understand better.

https://image.slidesharecdn.com/chemica ... 1331539456


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 4 guests