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  • dissociation constants  (4)
  • complexation constants  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Dissociation quotients of succinic acid in aqueous sodium chloride media to 225°C (1995)
    Springer
    Journal of solution chemistry 24 (1995), S. 65-87 
    Details
    ISSN: 1572-8927
    Keywords: Succinic acid ; butanedioic acid ; dissociation constants ; thermodynamics ; potentiometry ; ionic strength
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The first and second molal dissociation quotients of succinic acid were measured potentiometrically with a hydrogen-electrode, concentration cell. These measurements were carried out from 0 to 225°C over 25° intervals at five ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The dissociation quotients from this and two other studies were combined and treated with empirical equations to yield the following thermodynamic quantities for the first acid dissociation equilibrium at 25°C: log K1a=−4.210±0.003; ΔH 1a 0 =2.9±0.2 kJ-mol−1; ΔS 1a 0 =−71±1 J-mol−1-K−1; and ΔC p1a 0 =−98±3 J-mol−1-K−1; and for the second acid dissociation equilibrium at 25°C: log K2a=−5.638±0.001; ΔH 2a 0 = −0.5±0.1 kJ-mol−1; ΔS 2a 0 =−109.7±0.4 J-mol−1-K−1; and ΔC p2a 0 = −215±8 J-mol−1-K−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973050
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  • 2
    Electronic Resource
    Electronic Resource
    Dissociation quotients of malonic acid in aqueous sodium chloride media to 100°C (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 883-900 
    Details
    ISSN: 1572-8927
    Keywords: Malonic acid ; propanedioic acid ; dissociation constants ; thermodynamics ; potentiometry ; ionic strength
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The first and second molal dissociation quotients of malonic acid were measured potentiometrically in a concentration cell fitted with hydrogen electrodes. The hydrogen ion molality of malonic acid/bimalonate solutions was measured relative to a standard aqueous HCl solution from 0 to 100°C over 25° intervals at five ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The molal dissociation quotients and available literature data were treated in the all anionic form by a seven-term equation. This treatment yielded the following thermodynamic quantities for the first acid dissociation equilibrium at 25°C: logK 1a =-2.852±0.003, ΔH 1a /o =0.1±0.3 kJ-mol−1, ΔS 1a o =−54.4±1.0 J-mol−1-K−1, and ΔC p,1a o =−185±20 J-mol−1-K−1. Measurements of the bimalonate/malonate system were made over the same intervals of temperature and ionic strength. A similar regression of the present and previously published equilibrium quotients using a seven-term equation yielded the following values for the second acid dissociation equilibrium at 25°C: logK2a=−5.697±0.001, ΔH 2a o =−5.13±0.11 kJ-mol−1, ΔS 2a o =−126.3±0.4 J-mol−1-K−1, and ΔC p,2a o =−250+10 J-mol−1-K−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651513
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  • 3
    Electronic Resource
    Electronic Resource
    Dissociation quotients of oxalic acid in aqueous sodium chloride media to 175°C (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 905-927 
    Details
    ISSN: 1572-8927
    Keywords: Oxalic acid ; ethanedioic acid ; dissociation constants ; thermodynamics ; potentiometry ; ionic strength
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The first and second molal dissociation quotients of oxalic acid were measured potentiometrically in a concentration cell fitted with hydrogen electrodes. The emf of oxalic acid-bioxalate solutions was measured relative to an HCl standard solution from 25 to 125°C over 25o intervals at nine ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The molal dissociation quotients and available literature data were treated in the all anionic form by a five-term equation that yielded the following thermodynamic quantities at infinite dilution and 25°C: logK1a=−1.277±0.010, ΔH 1a o =−4.1±1.1 kJ-mol−1, ΔS 1a o =38±4 J-K−1-mol−1, and ΔC p,1a o =−168±41 J-K−1-mol−1. Similar measurements of the bioxalate-oxalate system were made at 25o intervals from 0 to 175°C at seven ionic strengths from 0.1 to 5.0m. A similar regression of the experimentally-derived and published equilibrium quotients using a seven-term equation yielded the following values at infinite dilution and 25°C: logK2a=−4.275±0.006, ΔH 2a o =−6.8±0.5 kJ-mol−1, ΔS 2a o =−105±2 J-K−1-mol−1, and ΔC p,2a o =−261±12 J-K−1-mol−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01074952
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  • 4
    Electronic Resource
    Electronic Resource
    Cadmium Malonate Complexation in Aqueous Sodium Trifluoromethanesulfonate Media to 75°C; Including Dissociation Quotients of Malonic Acid (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 195-216 
    Details
    ISSN: 1572-8927
    Keywords: Malonic acid ; propanedioic acid ; dissociation constants ; cadmium ; complexation constants ; sodium trifluoromethanesulfonate ; potentiometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The molal formation quotients for cadmium–malonate complexes were measured potentiometrically from 5 to 75°C, at ionic strengths of 0.1, 0.3, 0.6 and 1.0 molal in aqueous sodium trifluoromethanesulfonate (NaTr) media. In addition, the stepwise dissociation quotients for malonic acid were measured in the same medium from 5 to 100°C, at ionic strengths of 0.1, 0.3, 0.6, and 1.0 molal by the same method. The dissociation quotients for malonic acid were modeled as a function of temperature and ionic strength with empirical equations formulated such that the equilibrium constants at infinite dilution were consistent, within the error estimates, with the malonic acid dissociation constants obtained in NaCl media. The equilibrium constants calculated for the dissociation of malonic acid at 25°C and infinite dilution are log K 1a=-2.86 ± 0.01 and log K 2a=-5.71 ± 0.01. A single Cd–malonate species, CdCH2C2O4, was identified from the complexation study and the formation quotients for this species were also modeled as a function of temperature and ionic strength. Thermodynamic parameters obtained by differentiating the equation with respect to temperature for the formation of CdCH2C2O4 at 25°C and infinite dilution are: K = 3.45 ± 0.09, ΔS° = 7 ± 6 kJ-mol-1, ΔS° = 91 ± 22 J-K--mol-1, and ΔC p o =400±300 J­K-1­mol-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022638817245
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