van't Hoff Equation

[William Lan 2l]

How do we know whether we're calculating K1 or k2? Also, when do we even use the van't Hoff Equation in the first place?

[Vasiliki G Dis1C]

Hey! It doesn't matter if you calculate K1 or K2, as long as you keep it consistent. For instance, if the question gives you two temperatures, 298K and 345K, and you call those T1 and T2, then your K1 would be the value for the 298K and the K2 would be for 345K. One of those K values would be unknown depending on what the questions asks. And the purpose of the van't hoff equation is to calculate the value of K at a different temperature when you have the value of ΔH. Hope this helps!

[Juanyi Tan 2K]

Also, equilibrium constant, K, is independent of pressure but is dependent of temperature, so the Van't Hoff equation connects the change in equilibrium constant to the change in temperature,