equilibrium constant

Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.

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.
References in periodicals archive ?
By introducing the values of equilibrium constants of individual reactions and simplifying yields Eq.
Rate and equilibrium constants for the reactions of alkoxysilanes with monosolvated alkylmagnesium chlorides in toluene at 20[degrees]C Silane Grignard reagent K, L x [mol.
The standard equilibrium constant variation with the acidic content within the polystyrene matrix may be due to several factors, particularly a change in the morphology of the acidic copolymer with the amount of the self-association hydrogen bonding and their distribution within the polymer chain as the density of the carboxylic groups and temperature increased.
Physical interactions among polymer functional groups are represented with traditional [chi] parameters, while Chemical interactions are represented with equilibrium constants.
Generally it is hydrogen bonding equilibrium process which has been studied and equilibrium constant determined [1-6]; kinetics of hydrogen bonding has, for some reasons, attracted less attention of workers.
In this report we determined the equilibrium constant and rate constants of reactions of benzyl viologen and its reduced forms with bCD.
da]), and consequently, the equilibrium constant of the process ([K.
Equilibrium constant (Kd) a dimensionless parameter was calculated from the initial concentration (C0) and equilibrium concentration (Ce) by using equation 10.
Frontal affinity chromatography (FAC) thus established allowed us by a simple experiment to determine the most important parameter of specific interaction, that is, an equilibrium constant (dissociation constant or association constant).
qe=Qm Ka Ce/1+ Ka Ce 5Where qe is the amount of dye biosorbed on thebiomass (mg/g) at equilibrium Ce is the equilibriumconcentration of dye solution Qm is the maximumbiosorption capacity describing a complete monolayeradsorption (mg/g) and Ka is adsorption equilibrium constant (l/mg) that is related to the free energy of biosorption.

Full browser ?