Equilibrium-Constant Expressions - These are algebraic equations that describe the concentration relationships that exist among reactants and products at equilibrium. Among other things, equilibrium-constant expressions permit calculation of the error resulting from the quantity of unreacted analyte that remains when a steady state has be reached.
[Hollar, J. F., D. A. Skoog, D. M. West. Fundamentals of Analytical Chemistry. Saunders College Publishing, Fort Worth, Texas; 1996. p. 126.]
Atmospheric Chemistry Glossary