> For the complete documentation index, see [llms.txt](https://knowmayus.gitbook.io/chemistry/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowmayus.gitbook.io/chemistry/2.3-how-far-the-extent-of-chemical-change/2.3.2-and-2.3.3-the-equilibrium-law.md).

# 2.3.2  and 2.3.3  The Equilibrium Law

When a closed chemical system is at equilibrium, the ratio of the equilibrium concentrations of the reactants and products raised to the power of their stoichiometric coefficients is a constant.

Along with the previous conditions, the temperature must be constant — these observations is what essentially makes the Equilibrium Law. This constant is called the equilibrium constant, $$K$$.