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}
✍ Scribed by Jia-Zhen Yang; Ru-Bo Zhang; Hong Liu; Jie Wang
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 128 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0021-9614
No coin nor oath required. For personal study only.
✦ Synopsis
The standard potential of the (Ag, AgCl) electrode E o , the standard second ionization constant of sulfuric acid K 2 , and the standard association constant of the ion pair [MgSO 4 ] o , K in {0.03226 CO(NH 2 ) 2 + 0.96774 H 2 O} 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 pK 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.