### Van’t Hoff Equation

Posted:

**Sun Feb 23, 2020 11:24 pm**What does the equation measure? 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=136&t=60189

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Posted: **Sun Feb 23, 2020 11:24 pm**

What does the equation measure? How does it relate to gibbs free energy?

Posted: **Sun Feb 23, 2020 11:29 pm**

The Van't Hoff Equation can be used to calculate the k at a different temperature if change in enthalpy is known and is constant.

Posted: **Sun Feb 23, 2020 11:40 pm**

The vant hoff equation can be used to calculate K at different temperatures if stand enthalpy of real lion is known.

Posted: **Tue Feb 25, 2020 5:40 pm**

kristi le 2F wrote:The vant hoff equation can be used to calculate K at different temperatures if stand enthalpy of real lion is known.

what is real lion

Posted: **Wed Feb 26, 2020 3:05 pm**

805097738 wrote:kristi le 2F wrote:The vant hoff equation can be used to calculate K at different temperatures if stand enthalpy of real lion is known.

what is real lion

probably "real ion" if I had to guess

Posted: **Wed Feb 26, 2020 3:44 pm**

Van't Hoff's equation is:

ln(K2/K1)= (-DeltaH/R)(1/T2 - 1/T1)

So the equation relates enthalpy too but this value should be given in the problem.

ln(K2/K1)= (-DeltaH/R)(1/T2 - 1/T1)

So the equation relates enthalpy too but this value should be given in the problem.

Posted: **Mon Mar 09, 2020 3:41 pm**

Will this be on the final exam formula sheet?

Posted: **Mon Mar 09, 2020 3:49 pm**

Should we also know to derive it?

Posted: **Mon Mar 09, 2020 8:30 pm**

it is used to calculate k at different temperatures

Posted: **Tue Mar 10, 2020 6:01 pm**

How do you know to use Van't Hoff Equation? Are there certain questions in problems that signal to use it?

Posted: **Tue Mar 10, 2020 6:10 pm**

ln(K2/K1)= (-DeltaH/R)(1/T2 - 1/T1)

you can use it to calculate K value at a temperature given the K value at another temperature

you can use it to calculate K value at a temperature given the K value at another temperature

Posted: **Tue Mar 10, 2020 6:34 pm**

You can calculate K at different temperatures with the Van't Hoff equation. I don't see how it relates to DeltaG though because the only relation between DeltaG and K is with standard DeltaG, and since Van't Hoff equation doesn't calculate K at standard conditions, you can't use that K in the equation: standard DeltaG = -RTlnK