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Cryoscopic Studies in Molten Salts. On dissociation state of vanadium pentoxide and some alkali vanadates in molten K 2 Cr 2 O 7 and KNO 3
Author(s) -
Hassanein M.,
Youssef N. S.
Publication year - 1978
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19784420128
Subject(s) - chemistry , alkali metal , vanadium , dissociation (chemistry) , pentoxide , solvent , inorganic chemistry , freezing point , freezing point depression , analytical chemistry (journal) , thermodynamics , chromatography , organic chemistry , physics
The dissociation state of very low concentrations of the following solutes: a — V 2 O 5 , NH 4 VO 3 , KVO 3 , NaV 3 O 8 Na 4 V 2 O 7 , K 4 V 2 O 7 in molten K 2 Cr 2 O 7 and b — NaVo 3 KVO 3 , Na 4 V 2 O 7 , K 4 V 2 O 7 , Na 3 VO 4 in molten KNO 3 was studied cryoscopically. The depression in freezing point was obtained by measuring the corresponding cooling curves. The results with the solvent K 2 Cr 2 O 7 showed that a reaction occured between it and the solutes, which was not a simple one. Generally, heteropolyions such as (CrVo 7 ) 3− , (CrV 2 O 10 ) 4− and (Cr 2 V 3 O 16 ) −5 were probably formed. In case of the the solvent KNO 3 , the results showed that the investigated types of vanadates were dissociated giving the orthobvanadate (VO 4 ) 3− ions.