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On the kinetics of crystallization of zinc oxalate (III). Effect of supersaturation
Author(s) -
Kirkova E.,
Djarova M.
Publication year - 1977
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19770120803
Subject(s) - supersaturation , crystallization , chemistry , zinc , thermodynamics , kinetics , oxalate , inorganic chemistry , physics , organic chemistry , quantum mechanics
The crystallization kinetics of zinc oxalate at different supersaturations was studied by a turbidimetry method. It was found that the curves optically registered by this method can be quantitatively characterized at intial supersaturations lower than 4.51. The graphically differentiated curves showed that the maximum crystallization rate could be fitted by equation V max ≅ K ( C – C 0 ) 2 , Where C and C 0 are the initial and the equilibrium concentrations, respectively. The crystallization rates after the maximum follow the same equation depending on the absolute supersaturation at a given moment. A linear dependence between the rate constants and the supersaturations at the maximum crystallization rates is found. This dependence is determined by the inversely proportional correlation of the distances between the steps of growth with the supersaturation given by equation of the distances between the steps of growth with the supersaturation given by equation (8). The activation growth energy E * = 7.1 kcal/mole is determined from the straight line obtained.