### Derivations

Posted:

**Sun Feb 17, 2019 12:20 am**Can somene help me understand what we use the ln(K2/K1)=-(deltaH/R)[1/T2-1/T1] equation?

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=132&t=42296

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Posted: **Sun Feb 17, 2019 12:20 am**

Can somene help me understand what we use the ln(K2/K1)=-(deltaH/R)[1/T2-1/T1] equation?

Posted: **Sun Feb 17, 2019 8:46 am**

We use this equation to calculate the equilibrium constant K for a reaction at a different, new temperature (K is dependent on temperature).

Specifically, K1 is your currently known equilibrium constant at initial Temperature (T1). Then, given that you know the reaction enthalpy, you use this equation to solve for the new equilibrium constant (K2) at a new target temperature (T2).

Specifically, K1 is your currently known equilibrium constant at initial Temperature (T1). Then, given that you know the reaction enthalpy, you use this equation to solve for the new equilibrium constant (K2) at a new target temperature (T2).

Posted: **Sun Feb 17, 2019 11:48 am**

The equation is called the Van't Hoff Equation, and it helps show temperature dependence of K! It can be used to find K at different temperatures.

Posted: **Tue Feb 26, 2019 4:44 pm**

Conceptually, how does a change in temperature effect the equilibrium concentrations?