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equilibrium constant
Thesaurus| Noun | 1. | equilibrium constant - (chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction)chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactionsconstant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"dissociation constant - the equilibrium constant for a reversible dissociation |
equilibrium constant
equilibrium constant[‚ē·kwə′lib·rē·əm ‚kän·stənt] (chemistry) A constant at a given temperature such that when a reversible chemical reaction cC + bB = gG + hH has reached equilibrium, the value of this constant K 0 is equal to where aG , aH , aC , and aB represent chemical activities of the species G, H, C, and B at equilibrium. equilibrium constant
e·qui·lib·ri·um con·stant (Keq), in the reaction A + B ⇄ C + D at equilibrium (that is, no net change in concentrations of A, B, C, or D), the concentrations of the four components are related by the equation Keq = [C][D]/[A][B]; Keq is the equilibrium constant If any component in the reaction has a multiplier (for example, H2 ⇄ 2H), that multiplier appears as an exponent in the calculation of K (for example, Keq = [H]2/[H2]). When this equation is applied to the ionization of a substance in solution, Keq is called the dissociation constant (Kd) and its negative logarithm (base 10) is the pKd.
See also: Henderson-Hasselbalch equation, mass:action ratio. AcronymsSeeKeqequilibrium constant
Words related to equilibrium constantnoun (chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction)Related Words- chemical science
- chemistry
- constant
- dissociation constant
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