What is the equilibrium constant formula?

1 Answer
anor277
May 9, 2017

#K_"eq"=([A][B])/([C][D])#

Explanation:

And this describes the equilibrium reaction:

#A+BrightleftharpoonsC+D#

For the derivation, which depends on equality of #"the rate forwards"# with respect to the #"rates backwards"#, see [this old answer.](https://socratic.org/questions/if-a-reaction-is-reversible-when-can-it-be-said-to-have-reached-equilibrium) Note that #K_"eq"# must be measured, and it has been measured for a variety of reactions.

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