The thermodynamics of aqueous borate solutions 4. The standard associationconstant of ion pair [CaB(OH)(4)](+)

Authors
Sun, B Yang, JZ Song, PS Deng, M Gao, YY
Citation
B. Sun et al., The thermodynamics of aqueous borate solutions 4. The standard associationconstant of ion pair [CaB(OH)(4)](+), ACT CHIM S, 57(9), 1999, pp. 992-996
Citations number
15
Categorie Soggetti
Chemistry
Journal title
ACTA CHIMICA SINICA
ISSN journal
05677351 → ACNP
Volume
57
Issue
9
Year of publication
1999
Pages
992 - 996
Database
ISI
SICI code
0567-7351(1999)57:9<992:TTOABS>2.0.ZU;2-T
Abstract
Emfs for the cell without liquid junction:Pt, H-2(101.325kPa) \ Li2B4O7 (m( 1)), CaCl2 (m(2)) \ AgCl - Ag are reported at five temperatures from 278.15 to 318.15 It. The standard association constant of ionic pair [CaB(OH)(4)] (+), K-d is determined by fitting to the cell results. The dependence of pK (d) on temperature T is expressed by an empirical equation: pk(d) = 0.6857 - 359.72/ T - 4.632 x 10(-3) T. The other thermodynamic quantities of the a ssociation process are also calculated. The results show that the driving f orce for the ion association reaction is association entropy.