# 12: Chemical Equilibriium

- Page ID
- 178909

- 12.3: The Equilibrium Constant
- The equilibrium constant, K, expresses the relationship between products and reactants of a reaction at equilibrium with respect to a specific unit.This article explains how to write equilibrium constant expressions, and introduces the calculations involved with both the concentration and the partial pressure equilibrium constant.

- 12.5: The Van't Hoff Equation
- The expression for equilibrium constant is a rather sensitive function of temperature given its exponential dependence on the difference of stoichiometric coefficients. A linear relation between ln K and the standard enthalpies and entropies can be constructed and is known as the van’t Hoff equation.