Conductimetric determination of ion-association constants for calcium,cobalt, zinc,and cadmium sulfates in aqueous solutions at various temperatures between 0°C and 45°C |
| |
| Authors: | Shunzo Katayama |
| |
| Institution: | (1) Inorganic Chemistry Laboratory, The Institute of Physical and Chemical Research, 351 Wako, Saitama, Japan |
| |
| Abstract: | Thermodynamic ion-association constants for calcium, cobalt, zinc, and cadmium sulfates in aqueous solutions were determined by means of conductivity measurements at various temperatures between 0°C and 45°C. The standard Gibbs energy, enthalpy, and entropy for the reaction M
2+
+SO
4
2–
 M
2+
·SO
4
2–
(M=Ca, Co, Zn, and Cd) were calculated from the temperature dependence of the ion-association constants. The values obtained are as follows:  G
298
o
=–12.42 kJ-mole
–1
, H
o
=6.11 kJ-mole
–1
, and S
298
o
=62.1 J-
o
K
–1
-mole
–1
for Ca
2+
·SO
4
2–
; G
298
o
=–12.84 kJ-mole
–1
, H
o
=5.00 kJ-mole
–1
, and S
298
o
=59.8 J-
o
K
–1
-mole–1 for Co
2+
·SO
4
2–
; G
298
o
=–12.65 kJ-mole
–1
, H
o
=8.65 kJ-mole
–1
, and S
298
o
=71.4 J-
o
K
–1
-mole
–1
for Zn
2+
·SO
4
2–
; G
298
o
=–13.28 kJ-mole
–1
, H
o
=8.39 kJ-mole
–1
, and S
298
o
=72.7 J-
o
K
–1
-mole
–1
for Cd
2+
·SO
4
2–
. |
| |
| Keywords: | Conductance ion association association constant Gibbs energy of association enthalpy of association entropy of association calcium sulfate cobalt sulfate zinc sulfate cadmium sulfate |
| 本文献已被 SpringerLink 等数据库收录！ |
|
