Potentiometric investigation of the hydrolysis of chromate(VI) ion in NaCl media to 175/sup 0/C
The hydrolysis of chromate ion was studied potentiometrically in a concentration cell fitted with hydrogen electrodes by titrating basic NaCl-Na/sub 2/CrO/sub 4/ solutions with standardized HCl against a NaOH reference solution. The temperature was varied from 25 to 175/sup 0/C at 25/sup 0/ intervals at the following ionic strengths (I): 0.1140, 0.2346, 0.5337, 0.9988, 2.940, and 5.239 (NaCl). Depending on the ionic strength, the molality of total chromium was varied from 0.001 to 0.100. The resulting titration curves could be resolved best in terms of three equilibria involving the formation of HCrO/sub 4//sup -/ (aq), Cr/sub 2/O/sub 7//sup 2 -/ (aq), and CrO/sub 3/Cl/sup -/ (aq). The equilibrium quotients for all three reactions were fitted as a function of temperature and ionic strength, and the molal thermodynamic parameters that were computed from these relationships are tabulated at specific ionic strengths over the experimental temperature range.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6086923
- Journal Information:
- J. Solution Chem.; (United States), Journal Name: J. Solution Chem.; (United States) Vol. 16:6; ISSN JSLCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE HYDROLYSIS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMATES
CHROMIUM COMPOUNDS
DECOMPOSITION
ELECTROMOTIVE FORCE
EQUILIBRIUM
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROLYSIS
HYDROXIDES
LEAST SQUARE FIT
LYSIS
MAXIMUM-LIKELIHOOD FIT
MEDIUM TEMPERATURE
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
POTENTIOMETRY
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLVOLYSIS
TEMPERATURE DEPENDENCE
THERMODYNAMIC ACTIVITY
THERMODYNAMICS
TITRATION
TRANSITION ELEMENT COMPOUNDS
VALENCE