- 作者: Moustafa Farag Bakr
- 中文摘要: The conductivity of some transition metal perchlorates, M(ClO4)2 (M2+ = Mn, Co, Ni, Cu and Zn) has been measured in urea-water mixtures at 288-318 K. The limiting molar conductivities and the ion association constants of these electrolytes were calculated by the Shedlovsky extrapolation method. The ion association constants decreased in the order Co > Ni > Zn with increasing the atomic number, whereas Cu > Mn in the ionic association constants as a result of the maximum temperature dependencies of Cu2+. The thermodynamic functions, ΔH° and ΔS°, for the formation of that ion pair have also been obtained. Both ΔH° and ΔS° for all the salts under study are positive values. On the other hand, the Walden products, Λoη, of the salts increase with an increase in temperature at 288-318 K, which indicate that these electrolytes behave as structure-makers or promotors. Also, the activation energies, E, have been calculated and discussed.
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