Solubility and equilibrium constants of lead in carbonate solutions (25°C,I = 0.3 mol dm−3) |
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| Authors: | Halka Bilinski Paul Schindler |
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| Institution: | 1. Department of Physical Chemistry, “Ruder Bo?kovi?” Institute, Zagreb, Croatia, Yugoslavia;2. Institute for Inorganic, Analytical and Physical Chemistry, University of Bern, Bern, Switzerland |
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| Abstract: | The solubilities of PbCO3(s), 2PbCO2·Pb(OH)2(s), and of 3PbCO3 2Pb(OH)2(s) have been studied at 25°C ± 0.1°C in solutions of the constant ionic strength I = 0.3 mol/dm3, consisting primarily of sodium perchlorate. A few experiments with hydrocerussite were performed in solutions of 0.1 M KNO3. The concentrations of lead and hydrogen ions have been determined in solution in contact with the solid phase. From experimental data the following values for equilibrium constants are obtained: log Pb2+]·pCO2·H+]?2 = 5.20log Pb2+]·pCO0.672·H+]?2 = 6.80log Pb2+]3·CO2?3]2·OH?]2 = ?44.08 (and ?44.8 forI = 0.1 M)log PbCO03]·Pb2+]?1·CO2?3]?1 = 5.40log Pb(CO3)2?2]·Pb2+]?1·CO2?3]?2 = 8.86 The data indicate that hydrocerussite is the most stable solid phase in natural waters. Comparison with the literature and needs for further research are also presented. |
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