k

Vuong_2F
Posts: 90
Joined: Sat Sep 14, 2019 12:17 am

k

what are the units of k?

605395381
Posts: 50
Joined: Mon Jun 17, 2019 7:24 am

Re: k

k is unit-less because it is a ration of concentrations of products and reactants

Christineg1G
Posts: 115
Joined: Fri Aug 09, 2019 12:15 am
Been upvoted: 1 time

Re: k

Typically, K doesn't have units since it is a ratio of similar quantities rather than specific concentrations.

AveryAgosto
Posts: 76
Joined: Wed Sep 18, 2019 12:16 am

Re: k

k has no units because it is a ratio

Esha Chawla 2E
Posts: 108
Joined: Thu Jul 25, 2019 12:17 am

Re: k

Vuong_2F wrote:what are the units of k?

K does not have any units.

charleejohnson1L
Posts: 99
Joined: Fri Aug 30, 2019 12:17 am

Re: k

this has always confused me as well, thank you for asking and thank you to those who answered!
is k the ratio of product concentration to reactant concentration at equilibrium?

ALegala_2I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: k

Capital K is the equilibrium constant while lower case k is the rate constant for kinetics.

Astrid Lunde 1I
Posts: 103
Joined: Sat Sep 07, 2019 12:16 am

Re: k

k is the constant rate so it has no units.

Cavalli_1H
Posts: 92
Joined: Thu Sep 19, 2019 12:15 am

Re: k

charleejohnson1L wrote:this has always confused me as well, thank you for asking and thank you to those who answered!
is k the ratio of product concentration to reactant concentration at equilibrium?
yes, and because it is a ratio it does not have units

Vuong_2F
Posts: 90
Joined: Sat Sep 14, 2019 12:17 am

Re: k

605395381 wrote:k is unit-less because it is a ration of concentrations of products and reactants

thanks for all the answers everyone but i forgot to clarify in my original question that i'm referring to the k that is in rate laws. i thought that k in the context of kinetics had units?

Labiba Sardar 2A
Posts: 103
Joined: Sat Jul 20, 2019 12:15 am

Re: k

Vuong_2F wrote:
605395381 wrote:k is unit-less because it is a ration of concentrations of products and reactants

thanks for all the answers everyone but i forgot to clarify in my original question that i'm referring to the k that is in rate laws. i thought that k in the context of kinetics had units?

In terms of kinetics, the units of k depend on what the order of the reaction is.
If it's 0 order: k = mol.L^-1.s^-1
If it's 1st order: k = s^-1
If it's 2nd order: k = L.mol^-1.s^-1

You can also figure out what the units of k will be by solving for k if you're given the rate, concentrations of the molecules involved in the reaction, and the order of each molecule involved in the reaction.