Chapter 14, Problem 114QRT

Interpretation Introduction

Interpretation:

The dissociation of water is exothermic or endothermic has to be determined.

Concept Introduction:

The relationship between equilibrium constant and enthalpy change of the reaction is given below.

  $\ln \left(\frac{K_1}{K_2}\right)=\frac{\Delta H^{\circ }}{R}\left(\frac{1}{T_2}-\frac{1}{T_1}\right)$

Where, $K_{1}and{K}_2$ are equilibrium constants, $R$ is Universal gas constant. $\Delta H^{\circ }$ is the change in enthalpy of the reaction and $T_{1}and{T}_2$ are absolute temperatures.

In an exothermic reaction, $\Delta H^{\circ }$ is negative and in an endothermic reaction $\Delta H^{\circ }$ is positive.