Minimum and Maximum

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madisondesilva1c
Posts: 91
Joined: Fri Sep 28, 2018 12:16 am

Minimum and Maximum

Postby madisondesilva1c » Fri Jan 11, 2019 10:43 pm

Is there a maximum equilibrium constant that exists, and or a minimum? IF so how does this affect calculations of reactions?

Sean_Rodriguez_1J
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Re: Minimum and Maximum

Postby Sean_Rodriguez_1J » Fri Jan 11, 2019 11:56 pm

Theoretically, there is no maximum or equilibrium constant that exists. However, there is a point where K is so large (the concentration of products is so much larger than the concentration of products) that the reaction is essentially running to completion. There is also a point where K becomes so close to 0 (concentration of reactants is so drastically larger than the concentration of products) that the reaction barely occurs and it is treated as such. Basically, there is no tangible limit to K, no calculations would be affected, and it's unlikely that we'll have to deal with extremely large equilibrium constants in this course (personally I have not seen anything beyond 10^-11 on the low side or 10^13 on the high side).

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

Re: Minimum and Maximum

Postby Matthew Tran 1H » Sat Jan 12, 2019 12:35 am

When K approaches very large or small values, essentially what is happening is that the reaction to going to completion or isn't happening at all. Therefore the reaction is not at equilibrium and you would not have an equilibrium constant. An example that Dr. Lavelle gave is class is strong acids. Strong acids completely dissociate, so they don't have an equilibrium constant since theoretically it is an infinitesimally large number.


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