## K in Van't Hoff

$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$

ashwathinair
Posts: 113
Joined: Sat Aug 17, 2019 12:17 am

### K in Van't Hoff

How/why does K as the equilibrium constant relate into the Van't Hoff equation? What does that mean conceptually?

Rory Simpson 2F
Posts: 106
Joined: Fri Aug 09, 2019 12:17 am

### Re: K in Van't Hoff

The Van't Hoff equation gives us a quantitative means of relating the change in temperature to the change in the equilibrium constant (and we can find the new equilibrium constants for a reaction at different temperatures).

Matt F
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

### Re: K in Van't Hoff

Earlier in the quarter we talked about how among changes in temperature, pressure, and concentration, temperature is the only one that can affect the K value for a reaction. Depending on if a reaction is endothermic or exothermic (value of delta H), the K value can be permanently increased or decreased. The Van't Hoff equation shows us this by relating K1 and K2 to changes in temperature (T2 and T1) and delta H naught

MaggieHan1L
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

### Re: K in Van't Hoff

The Van’t Hoff equation is to compare Ks at different temperatures. Thus if you know K at one temperature you can find K at another temperature as long as you know delta H, delta S, and R