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  • 1
    Electronic Resource
    Electronic Resource
    Solubility and Solvation of Carbon Dioxide in the Molten Li2CO3/Na2CO3/K2CO3 (43.5:31.5:25.0 mol-%) Eutectic Mixture at 973 K I. Experimental Part (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 583-588 
    Details
    ISSN: 1434-1948
    Keywords: Dicarbonate ion ; Autodissociation constant ; Electrochemistry ; Potentiometric titration ; Acidity ; Basicity ; Anions ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solubility of CO2 in the molten ternary eutectic mixture Li2CO3-Na2CO3-K2CO3 (43.5, 31.5, 25.0 mol.%) at 973 K has been determined by a titration technique. From the obtained titration curve, the solubility has been found to amount to 9.5·10-2 mol·L-1 (σ= 1.0) under a pressure of CO2 of 1 atm and the pKd value of the carbonate melt has been evaluated to 5.37 (σ5 = 0.24) if the concentrations of the solutes are expressed in mol·L-1. This pKd value is in good agreement with literature data but the solubility value reported in this work is much higher than most of those reported in the literature. A chemical dissolution of CO2 as C2O52- is proposed and the consequences of the occurrence of this species on the acidobasic properties of molten carbonates are discussed. It appears from the experimental results that the CO2/C2O52- equilibrium in the carbonate melt is a slow process.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Solubility and Solvation of Carbon Dioxide in the Molten Li2CO3/Na2CO3/K2CO3 (43.5:31.5:25.0 mol-%) Eutectic Mixture at 973 K II. Theoretical Part (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 589-592 
    Details
    ISSN: 1434-1948
    Keywords: Ab initio calculations ; Dicarbonate anion C2O52- ; Dicarbonate structure ; Dicarbonate stability ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A theoretical study of the structure and stability of the dicarbonate ion has been performed at the Hartree-Fock, MP2, and QCI/SD levels. A flexible 6-31+G(d) basis set was used to allow for the diffuse electron density appearing in the anions. A stable anion corresponding to two CO2 entities covalently bound to a central oxygen has been found. The formation reaction starting from the carbonate anion and carbon dioxide has also been studied. Its thermodynamic features favour the formation of the dicarbonate anion, which in turn may account for the impressive solubility of carbon dioxide in carbonate melts.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
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    Paper (German National Licenses)
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