| Autor: |
Ushio, Hidetoshi, Trimm, Harold H., Patel, Ramesh C., Zemany, Michael D. |
| Zdroj: |
Journal of Solution Chemistry; January 1981, Vol. 10 Issue: 1 p39-50, 12p |
| Abstrakt: |
Equations describing the temperature jump amplitudes associated with a system of two coupled reactions (TRIS-phenol red) as well as the ternary system (Mg2+-iminodiacetic acid-phenol red) are presented. The termodynamic parameters calculated from experimentally measured temperature perturbation amplitudes using a multiparametric curve fitting procedure are found to be in good agreement with those determined from pH- and costant rate thermometric titrations. For phenol red, pKI=7.55, ?HI=3.45 kcal, and for Mg2+ iminodiacetic acid, log KM=2.84, ?HM=3.25 kcal, were obtained. It is shown that this method can be used to determine accurate thermodynamic enthalpy changes over a narrow temperature interval of less than 1.0°C from a single experiment requiring about 50 µl of sample solution. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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