Contribution to the termodynamics of 1-(2-thiazolylazo)-2-naphthol in the water-nitrobenzene extraction system | Zendy

Emanuel Makrlík | Zendy; Petr Vaňura | Zendy

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Contribution to the termodynamics of 1-(2-thiazolylazo)-2-naphthol in the water-nitrobenzene extraction system

Author(s) -

Emanuel Makrlík,

Petr Vaňura

Publication year - 2000

Publication title -

journal of the serbian chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.227

H-Index - 45

eISSN - 1820-7421

pISSN - 0352-5139

DOI - 10.2298/jsc0008581m

Subject(s) - nitrobenzene , dissociation constant , chemistry , extraction (chemistry) , aqueous two phase system , aqueous solution , dissociation (chemistry) , partition coefficient , analytical chemistry (journal) , thermodynamics , chromatography , organic chemistry , physics , catalysis , biochemistry , receptor

General relations among thermodynamic parameters characterizing chemical equilibria including species ?2?+, HA, H+ and A- in both phases of a two-phase water-nitrobenzene extraction system have been derived. From the extraction measurements, the equilibrium distribution constant of electroneutral 1-(2-thiazolylazo)-2-naphthol (TAN, HA) between the nitrobenzene and aqueous phases has been determined: log ATD(HA) = 3.90?0.02. By using this value and further known constants and applying the mentioned relations, the following values of dissociation constants of TAN in nitrobenzene saturated with water have been calculated for a temperature of 25?C: pKdnb(H2A+) = -log Kdnb(H2A+) = 4.9 and pKdnb(HA) = -log Kdnb(HA) = 16.5.

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