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Units for K

Posted: Sun Jan 12, 2020 5:35 pm
by Alexis Robles 2k
So we do not use units for K? Can someone explain this to me?

Re: Units for K

Posted: Sun Jan 12, 2020 5:40 pm
by Tiffany Chao 2H
No because K is a constant. We use brackets around equilibrium concentration. The brackets indicate molar concentration so we omit actual units.

Re: Units for K

Posted: Sun Jan 12, 2020 5:42 pm
by Jasleen Kahlon
K is representative of a ratio, products/reactants. It is used to compare rates of reaction and therefore does not have units.

Re: Units for K

Posted: Sun Jan 12, 2020 5:49 pm
by chrisleung-2J
Neither K nor Q have units

Re: Units for K

Posted: Sun Jan 12, 2020 5:51 pm
by William Chan 1D
K doesn't have units technically because they all cancel out, and it comes out to be just a number ratio.

Re: Units for K

Posted: Sun Jan 12, 2020 5:52 pm
by 205154661_Dis2J
Equilibrium constants have no units; this is because it is a ratio of similar quantities.

Re: Units for K

Posted: Sun Jan 12, 2020 5:56 pm
by TanveerDhaliwal3G
K doesn't have units because it is a ratio of molar concentrations.

Re: Units for K

Posted: Sun Jan 12, 2020 8:22 pm
by CalvinTNguyen2D
K does not have any units associated with it, since it's just a ratio of different molecules and species.

Re: Units for K

Posted: Sun Jan 12, 2020 8:37 pm
by SVajragiri_1C
K is a constant because when calculating it all the units cancel out, so there is no unit for it.

Re: Units for K

Posted: Sun Jan 12, 2020 10:03 pm
by kendal mccarthy
K is a constant, meaning there are no units used. But, it is a good way to check your work if you end up with units because there should not be any because they should all cancel out.

Re: Units for K

Posted: Sun Jan 12, 2020 10:16 pm
by Eesha Chattopadhyay 2K
In class, Dr. Lavelle mentioned briefly saying that technically K is the ratio if the activities of the products and reactants, which is unit-less.

Re: Units for K

Posted: Sun Jan 12, 2020 10:28 pm
by Morgan Carrington 2H
Since K is a ratio of values with the same units, they cancel out and are not present in the K value. I would still include them in the K expression to show my work though!

Re: Units for K

Posted: Sun Jan 12, 2020 10:41 pm
by SVajragiri_1C
There is no unit for K, it is a constant for equilibrium. You can prove this because when you solve for K, all the units cancel out.

Re: Units for K

Posted: Sun Jan 12, 2020 11:40 pm
by Veronica Lu 2H
There are no units since K is more so a ratio

Re: Units for K

Posted: Sun Jan 12, 2020 11:58 pm
by Angela Wu-2H
K has no units because of "activity"; however, activity is really low (close to 1) for the most part, so the equation ratio is simplified to the form that we know. But also, in the ratio, the units in the numerator and denominator will cancel out.

Re: Units for K

Posted: Mon Jan 13, 2020 11:34 am
by Mitchell Koss 4G
K has no units but units you plug in matter, so use mol/L not mL or mol.

Re: Units for K

Posted: Mon Jan 13, 2020 12:28 pm
by 105335337
K has no units as hen you do all the calculations, the units cancel out. Furthermore, this is because K is just a constant.

Re: Units for K

Posted: Mon Jan 13, 2020 12:29 pm
by pmokh14B
K does not have units it is a constant.

Re: Units for K

Posted: Mon Jan 13, 2020 1:41 pm
by Kallista McCarty 1C
Since K is a constant it does not have units associated with it!

Re: Units for K

Posted: Mon Jan 13, 2020 10:23 pm
by Jainam Shah 4I
K does not have units. The brackets signify its molarity or concentration of a reactant or product. As Dr. Lavelle discussed in class the true way to explain is via the ratio of the activities of the reactants and product. K is simply giving us the relative information of the rates and which reaction is favored. Activities don't have units and the expression we write assumes the activities are close to 1.

Re: Units for K

Posted: Mon Jan 13, 2020 11:29 pm
by 805422680
K does not have units as it is a constant value of the ratio of concentrations of products to reactants.

Re: Units for K

Posted: Tue Jan 14, 2020 9:33 am
by Celine 1F
K, a constant, demonstrates the ratio of products and reactants so it does not have units