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Chemical Equilibrium Calculator

The Chemical Equilibrium Calculator helps researchers in chemical equilibrium constants related calculations. The equilibrium constant ( Keq) for the reaction

aA + bB -> pP + qQ

is defined as the following:

Keq = [P]p[Q]q / [A]a[B]b.

Here [A}, [B], [P], and [Q] are concentrations of the chemical components.

Keq is a general term for equilibrium constant. There are several common specific forms of equilibrium constant. They may be considered special cases of Keq (e.g., Ka for the ionization constant of an acid, Kb for the ionization constant of a base, Kd for the dissociation constant, etc.).

Free energy changes in chemical reactions are linked to the equilibrium constant of the reaction by the equation

ΔG = ΔG0 + RT ln( Keq ).

At equilibrium ΔG = 0, thus

ΔG0 = - RT ln( Keq ).

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