Solvent effects on the dissociation reactions of tartaric, maleic and phthalic acids; comparative study and analysis of thermodynamic functions

The first and second dissociation constants of tartaric, maleic and phthalic acids have been determined using EMF method in water-ethanol mixed solvents, over a wide range of solvent composition (0–60 wt% ethanol) at six different temperatures (ranging from 30 to 55°C at intervals of 5°C). The therm...

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Bibliographic Details
Published in:Talanta (Oxford) 1997-12, Vol.45 (1), p.189-201
Main Authors: Zaghloul, A.A., El-Naggar, G.A., El-Shazly, Sh.A., Amira, M.F.
Format: Article
Language:English
Subjects:
Chemistry
Dicarboxylic acids
Dissociation constants
EMF Method
Exact sciences and technology
General and physical chemistry
Solution properties
Solutions
Solvent effect on
Thermodynamic parameters
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Summary:The first and second dissociation constants of tartaric, maleic and phthalic acids have been determined using EMF method in water-ethanol mixed solvents, over a wide range of solvent composition (0–60 wt% ethanol) at six different temperatures (ranging from 30 to 55°C at intervals of 5°C). The thermodynamic parameters (ΔG°, ΔH° and ΔS°) for the first and the second ionization reactions were calculated from the well known equations. The results have been discussed in terms of the solute-solvent interactions and were compared with those of malic, malonic and succinic acids in the same mixed solvents.
ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(97)00119-7