The Thermal Effects of Nucleation and Crystallization of KBr and KCL Solutions. III. The Heat of Crystallization and the Co‐Precipitation of Lead Ions
- 1 January 1974
- journal article
- research article
- Published by Wiley in Israel Journal of Chemistry
- Vol. 12 (4) , 817-826
- https://doi.org/10.1002/ijch.197400070
Abstract
Salt solutions saturated at 44° C and containing varying amounts of lead ions were allowed to cool to about 29°C in 5.5 h. The total heat, ΔHt, evolved decreased to 2/3 of its highest value with the increase of Pb2+‐concentration, while the amount of salt crystallized, Wc, decreased to nil. The distribution coefficient of Pb2+ between crystals and solution was 10.5 and 9.8 for KBr and KCl respectively. The high lead content improved the perfection of the crystals. The results are consistent with a two‐stage mechanism of crystallization: heterogeneous nucleation by complex ions and growth of crystals by the addition of bloc nuclei.Keywords
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