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Studies with dithizone: Part XXI. The Relationship between pH12 and Molar Solubility
Authors:HMNH Irving  NF Naqvi  CG Tilley
Institution:Department of Inorganic Chemistry, University of Cape Town South Africa;Department of Inorganic and Structural Chemistry, University of Leeds Gt. Britain;Inorganic Chemistry Laboratory, South Parks Road, OxfordGt. Britain
Abstract:The effect of changes of ionic strength on the partition of an analytically important weak acid between a variety of aqueous and immiscible organic phases has been studied with respect to new measurements on dithizone (3-mercapto-1,5-diphenylformazan) and di(p-tolyl)thiocarbazone. A linear relationship has been deduced between the pH at which 50% extraction takes place and Sr,o (the solubility of the reactant in the organic phase), and confirmed by measurements of pH12, and Sr,o for a large number of organic solvents. The solubilities of the reagents in water, Sr, are also reported. The form of the relationship between pH and log D, and between pH12 and log Sr,o is the same whether a solution of dithizone consists of a single species or a mixture of thiol and thione forms in tautomeric equilibrium.
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