Extraction of Sodium Picrate from Water into Nitrobenzene in the Presence of Dibenzo-21-Crown-7

Verfasser / Beitragende:
[E. Makrlík]
Ort, Verlag, Jahr:
2004
Enthalten in:
Zeitschrift für Physikalische Chemie/International journal of research in physical chemistry and chemical physics, 218/7/2004(2004-07-01), 887-891
Format:
Artikel (online)
ID: 378886525
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024 7 0 |a 10.1524/zpch.218.7.887.35727  |2 doi 
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245 1 0 |a Extraction of Sodium Picrate from Water into Nitrobenzene in the Presence of Dibenzo-21-Crown-7  |h [Elektronische Daten]  |c [E. Makrlík] 
520 3 |a From extraction experiments with 22Na as a tracer, the extraction constant corresponding to the equilibrium Na+(aq) + A−(aq) + L(nb) ⇔ NaL+(nb) + A−(nb) taking place in the two-phase water-nitrobenzene system (A− = picrate, L = dibenzo-21-crown-7; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as logKex(NaL+,A−) = 1.9±0.1. Further, the stability constant of the dibenzo-21-crown-7-sodium complex in nitrobenzene saturated with water was calculated for a temperature of 25°C log βnb(NaL+) = 7.1±0.1. 
540 |a © 2004 Oldenbourg Wissenschaftsverlag GmbH 
690 7 |a Thermodynamics & statistical physics  |2 nationallicence 
690 7 |a Laboratory techniques, experiments  |2 nationallicence 
690 7 |a Physical chemistry  |2 nationallicence 
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