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  • Activity coefficient  (1)
  • conductance  (1)
  • electrolyte solution  (1)
  • electrolytic conductivity  (1)
  • 5'-O-demethyl-8-O-methyl-dioncophylline A
  • Inorganic Chemistry
  • enthalpy
  • heat capacity
  • Springer  (3)
  • 1990-1994  (3)
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  • Springer  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    The dissociation constant of amino acids by the conductimetric method: I. pK 1 of MOPSO-HCl at 25°C (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 597-605 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Amino acids ; degree of dissociation ; electrolyte solution ; equivalent conductivity ; pK 1 ; thermodynamic dissociation constant
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The dissociation constants of amino acids are generally determined by acid-base titration and by the emf method. The use of the conductimetric method to obtain pK for amino acids appears to be the first of its kind. In this study, we describe the method of measurement, the treatment of the data and discuss the results. The choice of MOPSO for the investigation is in conjunction with the development of new buffer systems as pH Standard Reference Materials. The value for pK at 25°C is 0.060±0.005.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00649566
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Absolute determination of electrolytic conductivity for primary standard KCl solutions from 0 to 50°C (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 391-401 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Cell constant ; conductance ; demal ; electrolytic conductivity ; potassium chloride ; primary standards ; resistance ; specific conductance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract An absolute determination of aqueous electrolytic conductivity has been made for primary standards 0.01D and 0.1D (demal) potassium chloride solutions over the temperature range of 0 to 50°C in 5 degree intervals. A cell with a removable center section of accurately known length and area was used for the measurements. Values were adjusted to be in conformity with the ITS-90 temperature scale. The overall uncertainty over the entire temperature range is estimated to be 0.03%. Values at 25°C for 0.01D and 0.1D KCl solutions are 0.0014086 and 0.012852 S-cm−1, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00650765
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Investigation of the interaction of HCl and three amino acids, HEPES, MOPSO and glycine, by EMF measurements (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 311-321 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Activity coefficient ; amino acid ; EMF ; first dissociation constant ; HEPES ; glycine ; MOPSO ; ionic interaction ; hydrochloric acid
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Ionic interaction in the three systems Hcl-HEPES (N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid), HCl-MOPSO (3-(N-Morpholino)-2-hydroxypropanesulfonic acid), and HCl-glycine have been studied in terms of their mutual influence on the respective activity coefficients of each component. Activity coefficients for each component of the three systems are calculated from emf measurements of solutions containing HCl and the amino acid in a H2/solution/AgCl,Ag cell at 25°C. The first dissociation constant of HEPES at 25°C has also been determined using emf and pH titration measurements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00647854
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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