### Exponents and the K constant

Posted:

**Thu Jan 16, 2020 7:50 pm**Why do we use the coefficients in a reaction as exponents in the K constant? What do they imply?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=49&t=56462

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Posted: **Thu Jan 16, 2020 7:50 pm**

Why do we use the coefficients in a reaction as exponents in the K constant? What do they imply?

Posted: **Fri Jan 17, 2020 10:13 am**

We use exponents to indicate there are two moles of something reacting to form the molecule. Please correct me if I’m wrong!

Posted: **Fri Jan 17, 2020 11:02 am**

We don't need to know how the K equation, [products]^{x}/[reactants]^{y} is derived. I do not believe that making the coefficients exponents has any obvious conceptual implication.

Posted: **Sat Jan 18, 2020 4:09 pm**

We are essentially multiplying the concentrations of all the products. So if you have R1+R2 <-> 2P, it's like having P + P, so to find K, we multiply [P]x[P], so [P]^2.

Posted: **Sat Jan 18, 2020 4:54 pm**

i dont think you need to know how its derived but prof. jukka keranen teaches you how K is derived in his ls30A lecture if youre interested.