### Van't Hoff Equation

Posted:

**Tue Feb 18, 2020 11:58 am**When do you use the Van't Hoff Equation? And how does it relate to Gibbs Free Energy?

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=135&t=59629

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Posted: **Tue Feb 18, 2020 11:58 am**

When do you use the Van't Hoff Equation? And how does it relate to Gibbs Free Energy?

Posted: **Tue Feb 18, 2020 12:28 pm**

You use the Van't Hoff equation to find a different K at a different temperature if the enthalpy of a reaction is known. Using the equation, you plug in all the values you are given (K1, H, T1 and T2) to find K2. Or you can be given K2 instead of T2 and use the equation to find T2.

Posted: **Tue Feb 18, 2020 1:42 pm**

The Van't Hoff Equation is derived from two expressions for Gibbs Free Energy.

Posted: **Tue Feb 18, 2020 1:50 pm**

van't hoff equation is used to find the K value for different temperatures

Posted: **Wed Feb 19, 2020 3:40 pm**

You use the Van 't Hoff equation why you are asked to relate the change in the equilibrium constant, K, of a chemical reaction to the change in temperature, T. The question will likely give you the standard enthalpy change, ΔH, and ask for K, or vice versa.