Thermodynamics of ion pairs in mixed solvents. I. The standard association constant of the ion pair [ MgSO4]oin { 0.03226 CO(NH2)2 + 0.96774 H2O} |
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| Institution: | 1. Technical University “Gheorghe Asachi” of Iasi, Romania;2. Department of Mechanical Engineering, JNTUH College of Engineering, Kukatpally, Hyderabad 500085, India;1. College of Computer Science and Information Engineering, Henan University, Kaifeng 475004, PR China;2. Laboratory of Spatial Information Processing, Henan University, Kaifeng 475004, PR China |
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| Abstract: | The standard potential of the (Ag, AgCl) electrode Eo, the standard second ionization constant of sulfuric acid K2, and the standard association constant of the ion pair MgSO4]o, K in {0.03226CO(NH2)2 + 0.96774 H2O } at five temperatures from 278.15 K to 318.15 K were determined from precise e.m.f. measurements of different cells without liquid junction. The dependence of p K on temperature T is expressed by the empirical equation pK = 6.617 ? 777.9 · (K / T) ? 0.02001 · (T / K). The other thermodynamic functions of the association process were also calculated and show that the driving force for the process is the entropy of association. |
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