Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hatem G., Gaune-Escard M., Rasmussen S. B., Fehrmann R.
Заглавие : Conductivity, thermal measurements, and phase diagram of the Na2S2O7-NaHSO4 system
Место публикации : The Journal of Physical Chemistry B. - 1999. - V. 103, N 6. - С. 1027-1030. - ISSN 1089-5647. - ISSN 1089-5647
Примечания : Bibliogr.: 14 ref.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): диаграммы фазовые--фазовые диаграммы--проводимость--измерения термические--термические измерения--бинарные системы--системы бинарные--зависимости температурные--температурные зависимости--na2s2o7-nahso4--k2s2o7-khso4--na2s2o7--na--k--натрий--калий--nahso4--k2s2o7--khso4--химия
Аннотация: The conductivity of the Na2S2O7-NaHSO4 binary system has been measured for 15 different compositions in the full composition range, and in the temperature range 400-700 K. Phase transition temperatures were obtained, and the phase diagram was constructed. It is of the simple eutectic type, where the eutectic is found to have the composition X(NaHSO4)=0.97, as calculated from the measured thermodynamic properties, and to melt at 179 C. The partial enthalpy and entropy of mixing have been obtained, and the negative entropy points to a structural order of the melt, presumably due to hydrogen bonding, as found earlier for the K2S2O7-KHSO4 system. For each composition measured of the Na2S2O7-NaHSO4 system in the molten state, the conductivity has been expressed by equations of the form k=A(X)+B(X)(T-Tm)+C(X)(T-Tm)(2), where Tm is the intermediate temperature of the measured temperature range

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Hatem, G.; Gaune-Escard, M.; Rasmussen, S. B.; Fehrmann, R.