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### what does it do?

Posted: Fri Feb 21, 2020 2:30 pm
what is the difference between this equation and the other equations we know? what does it relate?

### Re: what does it do?

Posted: Fri Feb 21, 2020 8:14 pm
The Van't Hoff equation helps us find how K (the equilibrium constant) changes when temperature changes.

(P.S. I was confused about what equation you were referring to in your post. Even though it was in the Van't Hoff equation section, I recommend being specific in the posts just to avoid confusion)

### Re: what does it do?

Posted: Fri Feb 21, 2020 10:44 pm
When using the Van't Hoff equation, we assume that the difference in enthalpy is considered to be the same, and we assume that the difference in entropy between reactants and products is also the same at these two different temperatures. The reason this is valuable is because it enables us to show the dependence of temperature on the equilibrium constant, K; it's an indirect way to measure enthalpy as well. If the deltaH is known, Van't Hoff can be used to calculate K at a different temperature.

### Re: what does it do?

Posted: Sun Feb 23, 2020 4:11 pm
It helps us calculate the K at different temperatures (if we know the standard DeltaH)

### Re: what does it do?

Posted: Sun Feb 23, 2020 5:56 pm
Could you elaborate a little more on how it's an indirect way to measure enthalpy, please?

Chris Tai 1B wrote:When using the Van't Hoff equation, we assume that the difference in enthalpy is considered to be the same, and we assume that the difference in entropy between reactants and products is also the same at these two different temperatures. The reason this is valuable is because it enables us to show the dependence of temperature on the equilibrium constant, K; it's an indirect way to measure enthalpy as well. If the deltaH is known, Van't Hoff can be used to calculate K at a different temperature.

### Re: what does it do?

Posted: Sun Feb 23, 2020 11:15 pm
The Van't Hoff Equation helps relate K to the different values of T, since T affects K.

### Re: what does it do?

Posted: Mon Mar 02, 2020 1:13 pm
Noe BM 1J wrote:Could you elaborate a little more on how it's an indirect way to measure enthalpy, please?

Chris Tai 1B wrote:When using the Van't Hoff equation, we assume that the difference in enthalpy is considered to be the same, and we assume that the difference in entropy between reactants and products is also the same at these two different temperatures. The reason this is valuable is because it enables us to show the dependence of temperature on the equilibrium constant, K; it's an indirect way to measure enthalpy as well. If the deltaH is known, Van't Hoff can be used to calculate K at a different temperature.

The reason we can use the VH equation to indirectly measure enthalpy is because of the presence of enthalpy in the equation itself. The equation is as follows:
ln(K2/K1) = deltaH/R * (1/T1 - 1/T2). If we know two different equilibrium constants at two different temperatures, then we're able to calculate the enthalpy in a more indirect manner (as opposed to the typical method of calculating enthalpy by subtracting enthalpies of formation of the reactants from the products, or doing the same with bond enthalpies etc.)

### Re: what does it do?

Posted: Mon Mar 02, 2020 8:10 pm
The equ can also be used/written in several forms

### Re: what does it do?

Posted: Sun Mar 08, 2020 8:41 pm
Thank you! I see how it is related and it's definitely useful.

Chris Tai 1B wrote:
Noe BM 1J wrote:Could you elaborate a little more on how it's an indirect way to measure enthalpy, please?

Chris Tai 1B wrote:When using the Van't Hoff equation, we assume that the difference in enthalpy is considered to be the same, and we assume that the difference in entropy between reactants and products is also the same at these two different temperatures. The reason this is valuable is because it enables us to show the dependence of temperature on the equilibrium constant, K; it's an indirect way to measure enthalpy as well. If the deltaH is known, Van't Hoff can be used to calculate K at a different temperature.

The reason we can use the VH equation to indirectly measure enthalpy is because of the presence of enthalpy in the equation itself. The equation is as follows:
ln(K2/K1) = deltaH/R * (1/T1 - 1/T2). If we know two different equilibrium constants at two different temperatures, then we're able to calculate the enthalpy in a more indirect manner (as opposed to the typical method of calculating enthalpy by subtracting enthalpies of formation of the reactants from the products, or doing the same with bond enthalpies etc.)

### Re: what does it do?

Posted: Sun Mar 08, 2020 8:45 pm
it helps you find the K when there are changes in temperature

### Re: what does it do?

Posted: Sun Mar 08, 2020 8:46 pm
The Vanâ€™t Hoff equation can be used to calculate K when the reaction undergoes temperature changes.

### Re: what does it do?

Posted: Sat Mar 14, 2020 12:05 pm
Allows you to find K at different tempratures

### Re: what does it do?

Posted: Sat Mar 14, 2020 3:10 pm
Van't Hoff Equation is used to calculate the new equilibrium constant based on temperature change

### Re: what does it do?

Posted: Sat Mar 14, 2020 3:18 pm
It relates equilibrium constant to temperature.