Lexic.us

Definition of Equilibrium constant

1. Noun. (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).

Medical Definition of Equilibrium constant

1. The ratio of the reverse and forward rate constants for a reaction of the type: A + B = AB at equilibrium the equilibrium constant (K) equals the product of the concentrations of reactants divided by the concentration of product and has dimensions of concentration. Kd = (concentration A.concentration B) / (concentration AB). The affinity constant (Ka) is the reciprocal of the equilibrium constant. Dimension: moles per litre. In general the concept of Kd is more readily understood than that of Ka, for example: in considering the conversion of A to AB by the binding of ligand B, the Kd = B when A = AB. Thus Kd is equal to the ligand concentration which produces half maximal conversion (response). (10 Jan 1998)

Lexicographical Neighbors of Equilibrium Constant

Literary usage of Equilibrium constant

Below you will find example usage of this term as found in modern and/or classical literature:

1. Journal of the American Chemical Society by American Chemical Society (1915)
"... this experiment may be regarded as a sufficient basis for a provisional calculation of the equilibrium constant at this temperature. ..."

2. A System of Physical Chemistry by William Cudmore McCullagh Lewis, James Rice (1921)
"... number of molecules—Reactions involving a change in the number of molecules—Effect of change of temperature and pressure upon the equilibrium constant. ..."

3. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1921)
"From the values of the equilibrium constant obtained for this reaction at different temperatures (sec p. 161), the values of ij over narrow intervals of ..."

4. An Introduction to the Principles of Physical Chemistry from the Standpoint by Edward Wight Washburn (1921)
"Determination of the equilibrium constant.—In order to determine by direct measurement the numerical value of the equilibrium constant for a given reaction ..."

5. Proceedings of the Royal Society of London by Royal Society (Great Britain) (1902)
"In this case, R and R' denote the ratios of the absolute temperatures at which the values of the equilibrium constant of the two reactions are equal. ..."

6. Physical Chemistry for Colleges: A Course of Instruction Based Upon the by Earl Bowman Millard (1921)
"From the value of the equilibrium constant given as the average in Table 84, ... The equilibrium constant is 1.59 for the reaction CO2 + H2 = H2O + CO. ..."

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