This equation gives the quantitative temperature dependence of equilibrium constant (K).

**Van't
Hoff Equation**

This
equation gives the quantitative temperature dependence of equilibrium constant
(K). The relation between standard free energy change (ΔG°) and equilibrium
constant is

Differentiating
equation (3) with respect to temperature,

Equation
4 is known as differential form of van’t Hoff equation.

On
integrating the equation 4, between T_{1} and T_{2} with their
respective equilibrium constants K_{1} and K_{2}.

Equation 5 is known as integrated form of van’t Hoff equation.

For
an equilibrium reaction K_{p }= 0.0260 at 25° C ΔH= 32.4 kJmol^{-1},
calculate K_{p} at 37° C

T_{1}=25
+ 273 = 298 K

T_{2}
= 37 + 273 = 310 K

ΔH
= 32.4 KJmol^{-1} = 32400 Jmol^{-1}

R=8.314
JK^{-1} mol^{-1}

K_{P1}=
0.0260

K_{p2}=?

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

11th Chemistry : UNIT 8 : Physical and Chemical Equilibrium : Van't Hoff Equation |

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