(Ion + molecule) equilibrium technique applied to the determination of the activities of Cr2O3 and NiO. Standard molar Gibbs energy of formation of NiCr2O4

Autor:	Evgenii B. Rudnyi, M.T Varshavskii, Lev N. Sidorov, E. A. Kaibicheva, A.N Men
Rok vydání:	1990
Předmět:	Molar Chemistry Non-blocking I/O Analytical chemistry Atomic and Molecular Physics and Optics Ion Gibbs free energy symbols.namesake Ionization symbols Molecule General Materials Science Qualitative inorganic analysis Physical and Theoretical Chemistry Equilibrium constant
Zdroj:	The Journal of Chemical Thermodynamics. 22:623-632
ISSN:	0021-9614
DOI:	10.1016/0021-9614(90)90015-i
Popis:	The method for determination of the activities of Cr2O3 and NiO at high temperatures based on measuring the equilibrium constants of reactions with negative ions: Cr 2 O 3 (s)3CrO 4 − +CrO 3 − , NiO(s)+CrO 3 − +CrO 4 − =NiO 2 − +Cr 2 O 6 − , has been suggested. To produce measurable quantities of suitable ions in the saturated vapour small amounts of easily ionized substance (K2SO4 or K2CrO4) were added to the mixtures being investigated. The activities of Cr2O3 and NiO have been determined for heterogeneous (NiO + NiCr2O4) and (NiCr2O4 + Cr2O3) and the standard molar Gibbs energy of formation of NiCr2O4 from oxides has been calculated.
Databáze:	OpenAIRE
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