## Constant Calculation

Daniel Rivas 3L
Posts: 32
Joined: Fri Sep 29, 2017 7:07 am

### Constant Calculation

So as I noticed in lecture, when you are calculating the equilibrium constant for the opposite side of the equation, you can calculate it by taking the reciprocal of the constant of the first side. Is this always the case? Or was it only for the equation in lecture?

Hena Sihota 1L
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am
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### Re: Constant Calculation

By "the opposite side of the equation" do you mean the reverse reaction? If so, yes. If you have the value of the equilibrium constant for the forward reaction, you can calculate the value of the equilibrium constant for the reverse reaction by taking the reciprocal of the equilibrium constant for the forward reaction and vice versa.

Posts: 21
Joined: Fri Sep 29, 2017 7:04 am

### Re: Constant Calculation

The equilibrium constant of a reaction is the inverse of the equilibrium constant of its reverse reaction and vice versa. For example,
aA + bB <-> cC + dD
K of original reaction= ([C]^c [D]^d) / [A]^a [B]^b

cC + dD <-> aA + bB
K of reverse reaction= ([A]^a [B]^b) / [C]^c [D]^d
This equation is equivalent to
___________1______________, or 1/(K of the original reaction)
([C]^c [D]^d) / [A]^a [B]^b