van't Hoff equation


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van't Hoff e·qua·tion

(vahnt hof),
1. equation for osmotic pressure of dilute solutions.
2. for any reaction, d(ln Keq)/d(1/T) equals -ΔH/R where Keq is the equilibrium constant, T the absolute temperature, R the universal gas constant, and ΔH the change in enthalpy; thus, plotting ln Keq vs. 1/T allows the determination of ΔHo and ΔSo, where ΔHo and ΔSo are the standard changes in enthalpy and entropy, respectively.
[Jacobus H. van't Hoff]

van't Hoff e·qua·tion

(vahnt hof ĕ-kwā'zhŭn)
1. Calculation for osmotic pressure of dilute solutions.
See also: van't Hoff law
2. For any reaction, d(ln Keq/d(1/T) equals -ΔH/R,where Keq is the equilibrium constant, T the absolute temperature, R the universal gas constant, and ΔH the change in enthalpy; thus, plotting ln Keqvs. 1/T allows the determination of ΔH.
[Jacobus H. van't Hoff]

van't Hoff,

Jacobus H., Dutch chemist and Nobel laureate, 1852-1911.
Le Bel-van-t Hoff rule - see under Le Bel
van't Hoff equation - equation for osmotic pressure of dilute solutions for any reaction.
van't Hoff law - in stereochemistry, all optically active substances have one or more multivalent atoms united to four different atoms or radicals so as to form in space an unsymmetrical arrangement.
van't Hoff theory - that substances in dilute solution obey the gas laws.
References in periodicals archive ?
In order to elucidate the interaction of ligands to the BSA, the thermodynamic parameters ([DELTA]G, [DELTA]H and [DELTA]S) have been calculated by using van't Hoff equation at the temperatures 298, 303 and 308 K.
These parameters for the interaction between DIO and BSA were calculated by Van't Hoff equation (3) and thermodynamic equation (4).
Usually we take the hydrogen equilibrium pressure of the middle point of the desorption curve during PCT measurement, and the real-time temperature of the middle point to make van't Hoff plot to obtain desorption enthalpy and entropy according to the van't Hoff equation:
The van't Hoff equation allows the calculation of the effect of temperature on the degree of esterification:
The data of DSC analysis are listed in Table 6 For a given dosage, the freezing water content follows the van't Hoff equation; heats of mixing for various dosages are tabulated in Table 6.