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For an endothermic reaction, what happens to the equilibrium constant when the temperature is raised?

A $K$ decreases
B $K$ remains unchanged
C $K$ increases
D $K$ first increases and then decreases

Answer: C

By the van't Hoff equation,

\frac{d ln K}{d T} = \frac{Δ H ^{\circ}}{R T ^{2}}

. For an endothermic reaction

Δ H^{\circ} > 0

, so

ln K

and hence

K

rise with temperature.

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