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  • 1
    Electronic Resource
    Electronic Resource
    Apparent molar heat capacity and relative enthalpy of aqueous NaOH between 323 and 523K (1988)
    Springer
    Journal of solution chemistry 17 (1988), S. 481-497 
    Details
    ISSN: 1572-8927
    Keywords: Heat capacity ; enthalpy of dilution ; aqueous NaOH ; aqueous Na2SO4 ; high temperature ; flow calorimeter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The apparent molar heat capacity, C p,ϕ, of aqueous NaOH has been measured at temperatures between 50 and 250°C and molalities from 0.05 to 1.5 mol-kg−1. Enthalpies of dilution ΔLϕ were also determined at 99°C and apparent molar relative enthalpies Lϕ were calculated up to 1.9 m. Measurements were performed by means of a flow calorimetric apparatus constructed in our laboratory and standardized for C p,ϕ and ΔLϕ with aqueous Na2SO4 and with the formation of water from its ions, respectively. Characteristics and performance of this calorimeter are described in detail. Pitzer's semiempirical equations are used for the representation of the results and a general fitting of C p,ϕ data is reported using also recent literature values measured between 4 and 55°C. The fitted parameters are finally utilized, through an integration procedure, to derive a general equation to calculate Lϕ at any temperature between 4 and 250°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647315
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Apparent molar heat capacity and relative enthalpy of aqueous sodium hydroxoaluminate between 323 and 523 K (1989)
    Springer
    Journal of solution chemistry 18 (1989), S. 447-461 
    Details
    ISSN: 1572-8927
    Keywords: Heat capacity ; enthalpy of dilution ; aqueous NaAl(OH)4 ; high temperature ; flow calorimeter ; aluminum ion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The apparent molar heat capacities, Cp,ϕ, of alkaline aqueous solutions of aluminum ion in excess NaOH have been measured at temperatures between 50 and 250°C in the overall molality range 0.3–1.7 mol-kg−1. Enthalpies of dilution, ΔLϕ, have also been determined at 99°C and apparent molar relative enthalpies, Lϕ, were calculated starting from 2.16 mol-kg−1 as the maximum concentration. Measurements of the above quantities have been performed by means of a differential flow calorimeter built in our laboratory and already described. The thermodynamic data obtained and the corresponding quantities for aqueous NaOH previously determined have been fitted to the equations of the Pitzer ionic interaction model to obtain parameters relative to aqueous NaAl(OH)4. These parameters permit the calculation of Cp,ϕ, and Lϕ for this species over the examined range of temperatures and concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657332
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Subcritical and Supercritical Water Radial Distribution Function (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 1447-1471 
    Details
    ISSN: 1572-9567
    Keywords: Kihara energy function ; radial distribution function ; water ; supercritical fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theoretical and analytic expression for the first shell, and an analytic empirical expression for the whole radial distribution function (RDF) of water are introduced. All the asymptotic limits and functionalities of the RDF with temperature and density are incorporated in these expressions. An effective Kihara pair potential function is presented for water intermolecular interactions which incorporates the hydrogen bonding by using the chain association theory. The intermolecular pair potential parameters are adjusted to the experimental x-ray diffraction data of water RDF at various temperatures. The predicted first-shell results for water near critical and in supercritical conditions compare satisfactorily with the available neutron diffraction RDF data, with the simulation RDF results, and with the empirical RDF curves. The empirical expression initially proposed for the RDF of the Lennard–Jones fluid is extended to predict the RDF and the isothermal compressibility of water to conditions where experimental or simulated data are not available. Comparison with the Lennard–Jones fluid shows that the height of the first peak of water RDF changes much less at subcritical and supercritical conditions compared to that of the Lennard–Jones fluid which decreases appreciably going from subcritical to supercritical conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021939720336
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    Paper (German National Licenses)
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