Abstract
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.
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