CHEM 130 Lecture Notes - Lecture 34: Chemical Equilibrium, Equilibrium Constant, Chemical Equation
Document Summary
Chem 130: general chemistry: macroscopic investigations and reaction principles - The state reached by a reaction mixture when the rates of forward and reverse reactions have become equal. Although the forward and reverse reactions are continuing, no net change is observed. The continuing forward and reverse reactions make the equilibrium a dynamic process. An expression obtained by multiplying the concentrations of products, diving by the concentrations of reactants, and raising each concentration term to a power equal to the coefficient in the chemical equation. The value obtained for the equilibrium-constant expression when equilibrium concentrations are substituted. For the reaction aa + bb = cc + dd, kc = ([c]c[d]d/[a]a[b]b) The molar concentration of a substance is denoted by writing its formula in square brackets. The subscript c on the equilibrium constant means that it is defined in terms of molar concentrations. By looking at the magnitude of kc, you can tell whether a particular equilibrium favors products or reactants.
