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  • 1
    Electronic Resource
    Electronic Resource
    Solute-solvent effects in the acidic dissociation of the ampholyte N-tris(hydroxymethyl)methylglycine (“tricine”) in 50 mass % methanol-water solvent (1974)
    Springer
    Journal of solution chemistry 3 (1974), S. 905-916 
    Details
    ISSN: 1572-8927
    Keywords: Acidic dissociation ; ampholyte dissociation ; dissociation constants ; ionization ; methanol-water solvents ; solute-solvent effects ; N-Tris(hydroxymethyl)methylglycine (“tricine”) ; zwitterions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The pK values for the two acidic dissociation steps of the ampholyte N-tris-(hydroxymethyl)methylglycine (“tricine”) in 50 mass % methanol-water solvent have been determined by emf measurements of cells of the type Pt|H2(g, 1 atm), tricine buffer, Br−, AgBr|Ag over the range 5 to 50°C (pK 1)and 5 to 60°C (pK 2).The standard thermodynamic quantities ΔHo, ΔSo, and ΔC p o for the two dissociation processes have been derived and are compared with the corresponding values for tricine and the parent glycine in water and with those for other acids in 50 mass % methanol-water solvent. Both tricine and protonated tricine become weaker acids when methanol is added to the aqueous solvent. It appears that a strong stabilization of the zwitterion in water is responsible for this behavior. This conclusion is supported by comparing the changes in entropy and heat capacity for the dissociation of tricine with the values of these quantities for the dissociation of “model” acids of simple structure, such as ammonium ion and acetic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647944
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  • 2
    Electronic Resource
    Electronic Resource
    Conductance of tetraalkylammonium salts in propylene carbonate at 25°C (1978)
    Springer
    Journal of solution chemistry 7 (1978), S. 631-638 
    Details
    ISSN: 1572-8927
    Keywords: Association of ions ; conductivity ; dissociation ; ionization ; ion pairing ; nonaqueous solvents ; propylene carbonate ; solute-solvent effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Conductance measurements of 12 quaternary ammonium salts in propylene carbonate (PC) have been made at 25°C. The cations were either tetramethylammonium, tetraethylammonium, or tetra-n-butylammonium, and the concentrations of salt varied from about 2×10−4 to 5×10−3 M. The data were analyzed by the equation of Pitts. The results showed that the benzoate, nitrobenzoate, and pentachlorophenolate salts are completely dissociated. The nitrophenolate, chlorophenolate, methylsulfonate, and nitrate salts are only slightly associated (K A from 2.5 to 6.5), while the acetate, phenylacetate, and nitrophenolate salts display somewhat more extensive association, with ionpair association constants from 17 to 45. Limiting molar conductances for the anions were derived. The factors affecting ionic mobilities in this dipolar aprotic solvent are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646040
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mutual diffusion coefficients, electrical conductances, osmotic coefficients, and ionic transport coefficientsl ij for aqueous CuSO4 at 25°C (1980)
    Springer
    Journal of solution chemistry 9 (1980), S. 467-496 
    Details
    ISSN: 1572-8927
    Keywords: CuSO4 ; aqueous solutions ; diffusion ; conductance ; osmotic coefficients ; Onsager coefficientsl ij ; irreversible thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Experimental thermodynamic and transport data are presented for aqueous CuSO4 solution at 25°C from low concentrations to near saturation. Included are diffusion coefficients (Rayleigh interferometry), electrical conductances (DC method), and osmotic coefficients (isopiestic). These data and corresponding literature data are critically compared, as are literature density data. The resulting best values, together with previously compared transference number results, provide an extensive set of critically reviewed data for aqueous CuSO4. Onsager coefficientsl ij have been calculated for this salt and are compared with data for other valence types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647737
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamics of aqueous mixtures of sodium chloride, potassium chloride, sodium sulfate, and potassium sulfate at 25°C (1972)
    Springer
    Journal of solution chemistry 1 (1972), S. 167-172 
    Details
    ISSN: 1572-8927
    Keywords: Excess free energy of mixing ; mixed salt solutions ; osmotic coefficients ; KCl ; K2SO4 ; NaCl ; Na2SO4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Aqueous solutions of sodium chloride, potassium chloride, sodium sulfate, and potassium sulfate can be mixed in six ways to give ternary mixtures. Two of these have already been studied and results are now presented for the remaining four systems: H2O−NaCl−K2SO4, H2O−Na2SO4−K2SO4, H2O−KCl−Na2SO4, and H2O−KCl−K2SO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01028452
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  • 5
    Electronic Resource
    Electronic Resource
    Osmotic coefficients and activity coefficients of lodic acid at high concentrations (1974)
    Springer
    Journal of solution chemistry 3 (1974), S. 593-602 
    Details
    ISSN: 1572-8927
    Keywords: Activity coefficients ; iodic acid ; ionic equilibria ; isopiestic measurements ; osmotic coefficients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Isopiestic vapor pressure measurements have been used to determine the osmotic coefficients of aqueous solutions of iodic acid at molalities from 0.1 to 17 mole-kg−1 at 25°C. The isopiestic standards were solutions of sodium chloride and solutions of sulfuric acid. Because of the corrosive nature of iodic acid, platinum cups were used. Stoichiometric activity cofficients of iodic acid were derived by a Gibbs-Duhem integration. The activity coefficients for solutions of molality greater than 0.5 mole-kg−1 cannot be accounted for in terms of the two equilibria, namely, the acidic dissociation of iodic acid and formation of the ion H(IO3) 2 − , shown by Pethybridge and Prue to explain adequately the behavior in dilute solutions. The activity coefficient is unexpectedly small in concentrated solutions, suggesting the formation of neutral aggregates of iodic acid. The presence of dimers and tetramers, or alternatively trimers and tetramers, can explain the observed results up to a molality of 7 mole-kg−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650403
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    Paper (German National Licenses)
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