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  • 1
    Electronic Resource
    Electronic Resource
    Recent advances in the electromotive force method for determining transference numbers of electrolytes and characterizing new salt bridges (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 1305-1311 
    Details
    ISSN: 1572-8838
    Keywords: concentration cells ; salt bridges ; transference numbers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Recent transference-cell e.m.f. data sets for various 1:1 electrolytes in aqueous-organic solvent mixtures obtained in these laboratories for the determination of ionic transference numbers have been aggregated with earlier sets for 1:1 electrolytes in aqueous solutions and reexamined in the light of a new theoretical approach accounting for the solvent transfer phenomena accompanying ionic transfer. The potentialities and the precision of the transference-cell e.m.f. method have been highlighted, and new salt bridges, for use in aqueous-organic solvents, have been thereby characterized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003400311080
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Standards for pH measurements and first ionization constants ofo-phthalic acid. Methylcellosolve-water solvent mixtures from −10 to 45°C (1995)
    Springer
    Journal of solution chemistry 24 (1995), S. 1265-1279 
    Details
    ISSN: 1572-8927
    Keywords: Acidity scales ; pH-metric standards ; mixed solvents ; methylcellosolve-water ; 2-methoxyethanol ; potassium hydrogenphthalate buffer ; ionization constants ; o-phthalic acid ; benzene-1,2-dicarboxylic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract From reversible emf measurements of the cell Pt/H2/KHPh+KCl/AgCl/Ag/Pt, reference value pH-metric standards, pH RVS , for 0.05 mol-kg−1 potassium hydrogenphthalate (KHPh) reference buffer solutions in 20, 50, and 80 wt % methylcellosolve (2-methoxyethanol, CH3O-CH2CH2OH)-water solvent mixtures from −10 to +45°C, have been determined in compliance with the criteria endorsed by IUPAC. The corresponding values of the first ionization constant ofo-phthalic acid (H2Ph, benzene-1,2-dicarboxylic acid), which is a key quantity for the acquisition of pH RVS standards, have been determined from emf measurements of the reversible cell Pt/H2/H2Ph+KHPh+KCl/AgCl/Ag/Pt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972832
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  • 3
    Electronic Resource
    Electronic Resource
    Thermodynamics of the hydrogen-silver chloride cell in ethanol-water mixtures from −10 to +40°C (1988)
    Springer
    Journal of solution chemistry 17 (1988), S. 417-427 
    Details
    ISSN: 1572-8927
    Keywords: Ethanol-water solvent mixtures ; primary medium effect ; hydrogen-silver chloride cell ; standard emf ; standard thermodynamic functions ; activity coefficients of hydrochloric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract From emf E measurements of the reversible cell $$Pt|H_2 (g,1 atm)|HCl(m)|AgCl|Pt$$ at 0.01〈m〈0.1 mol-kg−1 in 70% (w/w) ethanol-water solvent mixtures over the temperature range from −10 to +40°C, the standard emf E° of the cell with the related thermodynamic functions of the cell reaction and the mean molal activity coefficients of hydrochloric acid have been determined. The present E data at 70% (w/w) ethanol have been combined with earlier data at ≤50% (w/w) ethanol to be analyzed critically by a one-stage multilinear regression method leading to an optimized set of E° values for the range 0–70% (w/w) ethanol which are essential for the assessment of pH standards in these solvent media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647309
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  • 4
    Electronic Resource
    Electronic Resource
    Transference Numbers of NaCl in Aqueous Mixtures with Organic Solvents of Moderate to Low Permittivities (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 1-16 
    Details
    ISSN: 1572-8927
    Keywords: Transference cells ; transference numbers ; salt bridges ; mixed solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Electromotive forces (emf) were measured in the transference cells: Ag∣AgCl∣- Nacl (m2) in Z∥ NaCl (m1) in Z∣AgCl∣Ag and NaxHg1-x∣NaCl (m1) in Z∥ NaCl (m2) in Z∣NaxHg1-x (where NaxHg1-x denotes a flowing Na–amalgam electrode and Z an aqueous-organic solvent mixture) at various molalities m 2 〉 m1 of NaCl in Z = (ethylene glycol + water), (acetonitrile + water) and (1,4-dioxane + water), with mass fractions of the organic components ≤0.8. The transference number of Na+ in (ethylene glycol + water) and (1,4-dioxane + water) varies little with respect to that in pure water medium, whereas in (acetonitrile + water) it increases remarkably with increasing proportion of acetonitrile so as to approach equitransference, behavior similar to that previously found in (methanol + water) and in (ethanol + water). At acetonitrile mass fraction 0.6 NaCl is sufficiently close to equitransference to emerge as a useful salt bridge, nearly at the same level as the popular aqueous KCl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022654127472
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    Paper (German National Licenses)
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