- Books Name
- Ritan Sheth Chemistry Book
- Publication
- Ritan Sheth
- Course
- CBSE Class 11
- Subject
- Chemistry
RELATIONSHIP BETWEEN EQUILIBRIUM CONSTANT K, REACTION QUOTIENT Q AND GIBBS ENERGY G.
A mathematical expression of thermodynamic view of equilibrium can be described by tine equation.
ΔG = ΔGº + RT InQ
Where, ΔGº is standard Gibbs energy.
At equilibrium, ΔG = 0 and Q = Kc, so the equation becomes,
0 = ΔGº + RT In Kc
Or, ΔGº = - RT InKc
On changing the base we get ΔGº = -2.303RT log Kc
We know that for a spontaneous process ΔG should be negative. So the value of Kc should be positive.