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  • Activity of ions  (1)
  • DL-valine  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Activity coefficients of sodium, potassium, and nitrate ions in aqueous solutions of NaNO3, KNO3, and NaNO3+KNO3 at 25°C (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 983-1000 
    Details
    ISSN: 1572-8927
    Keywords: Activity of ions ; electrolyte solutions ; ions ; sodium nitrate ; potassium nitrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ion selective electrodes have been used to measure the activity coefficients at 25°C of individual ions in aqueous solutions of NaNO3 up to 3.5 molal, KNO3 up to 3.5 molal and mixtures of NaNO3 and KNO3 up to 2.4 molal total nitrate ion concentration. The experimental results confirm that the activity coefficient of anion and cation in aqueous single electrolyte solutions of NaNO3 and KNO3 were different from each other over the whole range of concentrations studied. These effects are attributed to the ion-ion and ion-solvent interactions. The results also show that the activity coefficients of nitrate ions in the presence of sodium and potassium counterions do not depend significantly on the nature of the counterions present in the solution. The experimental data obtained in this study were correlated by a model proposed previously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972594
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  • 2
    Electronic Resource
    Electronic Resource
    Activity coefficients of DL-valine in aqueous solutions of KCl at 25°C. Measurement with ion selective electrodes and modelling (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 865-875 
    Details
    ISSN: 1572-8927
    Keywords: Activity coefficients ; ion selective electrodes ; DL-valine ; aqueous KCl solutions ; modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Electrochemical cells with two ion selective electrodes, a cation and an anion ion selective electrode, versus a double junction reference electrode were used to measure the activity coefficients of DL-valine at 298.15 K, up to 0.5 molality, in aqueous solutions of KCl up to 1.0 molality. The results obtained in this work are compared with those reported before for the activity coefficients of DL-valine in aqueous solutions of NaCl. The experimental data were correlated using the model proposed previously by Khoshkbarchi and Vera for the activity coefficients of amino acids in aqueous electrolytes solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972578
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    Paper (German National Licenses)
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