scholarly journals Interpretation and Significance of the Alternative Formulation of Van’t Hoff Equation

2018 ◽  
pp. 01-03
Author(s):  
Irfan H. Lone Jr.
Keyword(s):  
Equilibrium Constant ◽  
Effect Of Temperature ◽  
Alternative Form ◽  
Alternative Formulation ◽  
Van’T Hoff Equation ◽  
Hoff Equation ◽  
Van't Hoff Equation

The interpretation and significance of the alternative form of Van’t Hoff equation in the context of effect of temperature on the equilibria of exothermic and endothermic processes has been discussed. The central role that entropy plays in determining the dependence of equilibrium constant on temperature has been emphasized.

scholarly journals Determination of chlorzoxazone crystal growth kinetics and size distribution under controlled supersaturation at 293.15 K

2021 ◽  
Author(s):  
Satish G ◽  
Dhayananth N ◽  
Kalaichelvi Ponnusamy ◽  
Radhakrishnan T K ◽  
Karthika S
Keyword(s):  
Particle Size ◽  
Crystal Growth ◽  
Growth Kinetics ◽  
Operating Conditions ◽  
Batch Crystallization ◽  
Van’T Hoff Equation ◽  
Crystal Growth Kinetics ◽  
Nrtl Equation ◽  
Hoff Equation ◽  
Van't Hoff Equation

Background: Chlorzoxazone (CHZ) is a water-insoluble drug having bioavailability problems. The absorption rate of such drugs can be improved by reducing their particle size. In this work, the crystal growth kinetics of CHZ–ethanol for different degrees of supersaturation (SS) has been studied. Method: The equilibrium solubility data of CHZ in ethanol is determined by the shake-flask method within the 283.15–313.15 K temperature range. The mole fraction solubility of CHZ is calculated and correlated with the modified Apelblat equation, λh equation, van’t Hoff equation, Wilson, and non-random two liquid (NRTL) equation. Batch crystallization experiments are performed on three different degrees of SS-1.16, 1.18, and 1.20 at 293.15 K as a function of time. Results: The maximum root mean square difference (RMSD) and relative average deviation (RAD) values of 169.24 x10-6 and 0.699 x10-2, respectively, are observed in the NRTL equation model. The dissolution properties such as standard enthalpy, standard entropy, and Gibbs free energy are predicted using van’t Hoff equation. Using a simple integral technique, the average crystal growth rate constant KG is calculated as 1.58 (μm/min) (mg/ml)-1 and the order n=1 for CHZ–ethanol at 293.15 K. Conclusion: The obtained result concludes that the crystals growth size is found to be varied at different SS ratio in batch crystallization. The particle size control in batch crystallization can be achieved by optimizing the operating conditions to get the desired size crystals.

A non-ideal replacement for the Boyle van’t Hoff equation

Cryobiology ◽  
2008 ◽  
Vol 57 (2) ◽  
pp. 130-136 ◽  
Author(s):  
Richelle C. Prickett ◽  
Janet A.W. Elliott ◽  
Shamina Hakda ◽  
Locksley E. McGann
Keyword(s):  
Van’T Hoff Equation ◽  
Hoff Equation ◽  
Van't Hoff Equation

Forum on osmosis. II. A criticism of "solvent tension" in osmosis

1979 ◽  
Vol 237 (3) ◽  
pp. R108-R109 ◽  
Author(s):  
J. H. Hildebrand
Keyword(s):  
Hydrostatic Pressure ◽  
Liquid State ◽  
Semipermeable Membrane ◽  
Raoult’S Law ◽  
Van’T Hoff Equation ◽  
Hoff Equation ◽  
Classical Derivation ◽  
Van't Hoff Equation ◽  
Raoult's Law

Concepts about the liquid state that are inconsistent with the facts are noted, and solvent under tension is one of them. Osmosis is not present in a solution: it is a process in the presence of a semipermeable membrane that can be quantified by the operation of applying a hydrostatic pressure. The classical derivation of the van't Hoff equation from Raoult's law is reviewed. The soundness of the early views of G. H. Lewis has not changed.

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