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The Precipitation of Alkaline-Earth Metal Oxalate Powders from Aqueous Solution. Crystal Numbers and Final Sizes

✍ Scribed by Dr. A. Packter; P. Chauhan

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
367 KB
Volume
9
Category
Article
ISSN
0232-1300

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✦ Synopsis

The precipitation of magnesium oxalate dihydrate, calcium oxalate monohydrate, strontium oxalate monohydrate and barium oxalate hemihydrate was studied from equivalent solutions of concentrations from 0.001 M to 0.6 M, a t pHs from 7 to 6, by optical microscopy and other methods. Crystal growth started after induction periods : the precipitations were heterogeneously nucleated a t low supersaturations and homogeneously nucleated a t medium t o high supersaturations. The crystal form and numbers of the final precipitates depended on the type and number of the nuclei (and crystallites) frormed during the induction periods. Crystal numbers a t medium to high supersaturation, increased with increasing initial mean metal oxalate concentrations according to the relation, N = Nl ciox; B was 5 for calcium oxalate precipitations and was 6 for the other metal oxalate precipitations. The Nl values increased in the order

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