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K units

Posted: Tue Jan 14, 2020 11:52 pm
by Donna Nguyen 2L
Why are units omitted when calculating K?

Re: K units

Posted: Wed Jan 15, 2020 12:00 am
by Hui Qiao Wu 1I
Explaining in a non-chemistry way, K is the ratio of products over reactants. And ratios are just numbers; they don't have units.

Re: K units

Posted: Wed Jan 15, 2020 2:43 am
by Eunice Nguyen 4I
K is a unitless quantity, because it's just a ratio of product over reactants. This also goes into the concept of activities (but that hasn't been really gone over in depth yet)

Re: K units

Posted: Wed Jan 15, 2020 8:07 am
by Justin Sarquiz 2F
The equilibrium constant is actually the activity of the product divided by the activity of the reactant. Calculating the activity is its own separate equation, but in that equation the units actually cancel. Therefore, the activity of the products and reactants have no units making K have no units too.

Re: K units

Posted: Wed Jan 15, 2020 9:21 am
by Jasmine Vallarta 2L
K is a constant

Re: K units

Posted: Wed Jan 15, 2020 10:28 pm
by Christine Honda 2I
For the purpose of this class, K is unitless. But in higher classes, it refers to the "activity" of the reactants and products.

Re: K units

Posted: Wed Jan 15, 2020 10:45 pm
by BritneyP- 2c
When you are looking for K is is molarity over molarity, which can cancel out all units. And if it doesn't cancel out all units, imagine the reactants changing to products or products changing to reactancts as activity, and activity is unitless.

Re: K units

Posted: Thu Jan 16, 2020 12:44 pm
by Rohit Ghosh 4F
K is simply a ratio not a unit of measure

Re: K units

Posted: Thu Jan 16, 2020 1:21 pm
by Jasmine Fendi 1D
K actually measures the activity of the reaction. For this class, I think we omit the units for simplicity

Re: K units

Posted: Thu Jan 16, 2020 1:28 pm
by AngieGarcia_4F
I think it's because K is an activity and activities don't have units.

Re: K units

Posted: Thu Jan 16, 2020 1:32 pm
by 205405339
K is just a number that is used to show the ratio of products to reactants. I dont think K is ever used in equations so it doesnt need units anyways