Potentiometric Investigations of Carbonate Ion Stability in Molten Cesium and Sodium Iodides

The reaction of carbonate ion dissociation in molten CsI and NaI was studied in the temperature range from the melting point to 800 (CsI) and 830 °C (NaI) by a potentiometric method with the use of a membrane oxygen electrode as an indicator one. The dissociation constant of CO3 2- in the molten iod...

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Bibliographic Details
Published in:Inorganic chemistry 2002-03, Vol.41 (5), p.1045-1047
Main Authors: Cherginets, Victor L, Demirskaya, Olga V, Rebrova, Tatyana P
Format: Article
Language:English
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Summary:The reaction of carbonate ion dissociation in molten CsI and NaI was studied in the temperature range from the melting point to 800 (CsI) and 830 °C (NaI) by a potentiometric method with the use of a membrane oxygen electrode as an indicator one. The dissociation constant of CO3 2- in the molten iodides was found to increase with the temperature. pK values for CsI are 4.47 (650 °C), 4.23 (700 °C), 3.89 (750 °C), 3.44 (800 °C); those for NaI are 4.68 (700 °C), 4.39 (750 °C), 4.17 (800 °C), 3.92 (830 °C). The plots of pK vs reverse temperature are linear. Carbonate stability in molten CsI is lower than that in the NaI due to lower stability of Cs2CO3 compared with Na2CO3.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic015525m