Ionization constants and thermodynamic quantities of 2-mercaptocarboxylic acids in aqueous solution

1977 ◽  
Vol 6 (3) ◽  
pp. 183-190 ◽  
Author(s):  
K. J. Ellis ◽  
A. G. Lappin ◽  
A. McAuley
Keyword(s):  
Aqueous Solution ◽  
Ionization Constants ◽  
Thermodynamic Quantities

Thermodynamic quantities for the interaction of SO 4 2? with H+ and Na+ in aqueous solution from 150 to 320�C

1988 ◽  
Vol 17 (9) ◽  
pp. 841-863 ◽  
Author(s):  
J. L. Oscarson ◽  
R. M. Izatt ◽  
P. R. Brown ◽  
Z. Pawlak ◽  
S. E. Gillespie ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Quantities

THE ACIDITY OF SOME AROMATIC FLUORO ALCOHOLS AND KETONES

1960 ◽  
Vol 38 (3) ◽  
pp. 399-406 ◽  
Author(s):  
Ross Stewart ◽  
R. Van der Linden
Keyword(s):  
Aqueous Solution ◽  
Nitro Compounds ◽  
Ionization Constants

A series of five trifluoroacetophenones and five phenyl trifluoromethyl carbinols have been synthesized and their ionization constants in water measured. They are the unsubstituted, p-methoxy, p-methyl, m-bromo, and m-nitro compounds. The ketones exist as hydrates in aqueous solution and each is about two pK units stronger than the corresponding alcohol. The acidities of both series are correlated by the Hammett relation with ρ values of 1.11 and 1.01 for the ketone hydrates and alcohols respectively. The acid strengths vary from a pKa of 9.18 for m-nitro-α,α,α-trifluoroacetophenone to 12.24 for p-methoxyphenyl trifluoromethyl carbinol.

Potentiometric determinations of ionization constants of HSO4- and HCO3- ions in formamide

1977 ◽  
Vol 30 (12) ◽  
pp. 2621 ◽  
Author(s):  
UN Dash
Keyword(s):  
Ionization Constants ◽  
Thermodynamic Quantities ◽  
Different Temperatures

With the cell Ag-AgCl|KCl(m3), K2A(m2), KHA(m1), QH2-Q|Pt, where A stands for SO42- or CO32-, the ionization constants of the HSO4- and HCO3- ions in formamide have been determined at different temperatures. The standard thermodynamic quantities, ΔG�, ΔH� and ΔS�, have been calculated.

Thermodynamics of ionization of trans-crotonic and adipic acids in water; the silver – silver adipate electrode

1980 ◽  
Vol 58 (4) ◽  
pp. 323-327 ◽  
Author(s):  
Upendra Nath Dash ◽  
Uttam Kumar Nayak
Keyword(s):  
Adipic Acid ◽  
Silver Chloride ◽  
Ionization Constants ◽  
Thermodynamic Quantities ◽  
Liquid Junction ◽  
Different Temperatures ◽  
Heat Capacity Changes ◽  
Silver Silver ◽  
Silver Silver Chloride ◽  
Thermodynamics Of Ionization

The ionization constant, K, of trans-crotonic acid, and the first and second ionization constants, K1 and K2, of adipic acid have been determined in water at seven different temperatures ranging from 15 to 45 °C with the help of the cells without liquid junction using silver – silver chloride and quinhydrone electrodes. The variations of pK, pK1, and pK2 with temperature have been expressed by the equations[Formula: see text]and[Formula: see text]From the temperature coefficient of the ionization constants, the standard enthalpy, entropy, Gibbs energy, and heat capacity changes of the corresponding dissociation processes have been calculated. Using the values of ionization constants of adipic acid, the standard potential of the Ag(s)/Ag2Ad(s)/Ad2− electrode, and the related standard thermodynamic quantities for the electrode process[Formula: see text]have been calculated in water at those temperatures.

Thermodynamic quantities for the ionization of nitric acid in aqueous solution from 250 to 319�C

1992 ◽  
Vol 21 (8) ◽  
pp. 789-801 ◽  
Author(s):  
J. L. Oscarson ◽  
S. E. Gillespie ◽  
R. M. Izatt ◽  
X. Chen ◽  
C. Pando
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Thermodynamic Quantities

scholarly journals Studies on the application of the quinhydrone electrode in formamide. III. The ionization constants and related thermodynamic quantities of phthalic acid frome.m.f. measurements at different temperatures

1975 ◽  
Vol 28 (4) ◽  
pp. 793 ◽  
Author(s):  
UN Dash ◽  
B Nayak
Keyword(s):  
Phthalic Acid ◽  
Silver Chloride ◽  
Ionization Constants ◽  
Thermodynamic Quantities ◽  
Liquid Junction ◽  
Different Temperatures ◽  
Silver Silver ◽  
Silver Silver Chloride

The first and second ionization constants of phthalic acid have been determined, in formamide, at temperatures ranging from 5� to 45�C at 5� intervals, with the help of cells without liquid junction using quinhydrone and silver-silver chloride electrodes. By means of the Bjerrum equation, the distance r between the acidic groups has been estimated in formamide at different temperatures.

Studies on the application of the quinhydrone electrode in formamide. IV. The ionization constants and related thermodynamic quantities of picric acid from E.M.F. measurements at different temperatures

1975 ◽  
Vol 28 (4) ◽  
pp. 797 ◽  
Author(s):  
UN Dash ◽  
B Nayak
Keyword(s):  
Picric Acid ◽  
Ionization Constants ◽  
Thermodynamic Quantities ◽  
Temperature Range ◽  
Pka Value ◽  
Different Temperatures

The e.m.f, of the cell ���������������� Ag-AgCl/KCl(m3), KPic(m2), HPic(m1), QH2-Q|Au in formamide has been measured at 5� intervals over the temperature range 5-45�C. The pKa value of picric acid ranges from 2.19 � 0.12 at 5� to 1.16 � 0.08 at 45�.

The Fine Structure of Cytosine

1962 ◽  
Vol 15 (4) ◽  
pp. 851 ◽  
Author(s):  
DJ Brown ◽  
M Lyall
Keyword(s):  
Aqueous Solution ◽  
Nuclear Magnetic Resonance ◽  
Fine Structure ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectrum ◽  
Tautomeric Form ◽  
Resonance Spectrum ◽  
Ionization Constants ◽  
Recent Formulation ◽  
Related Compounds

The ionization constants and ultraviolet spectra of cytosine, of its appropriately methylated derivatives, and of related compounds are used to indicate that its pre- dominant tautomeric form in aqueous solution is 4-amino-1,2-dihydro-2-oxopyrimidine. This is in sharp contrast to its recent formulation as a zwitterion on the grounds of its nuclear magnetic resonance spectrum.

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