✦ LIBER ✦

Zur Mikrotitration organischer Verbindungen: Teil VIII: Scheinbare Dissoziationskonstanten yon Benzoesäuren, Phenolen und Benzolsulfonaniliden im System Methylcellosolve/Wasser

✍ Scribed by W. Simon; A. Mörikofer; E. Heilbronner

Publisher: John Wiley and Sons
Year: 1957
Tongue: German
Weight: 589 KB
Volume: 40
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19570400642

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✦ Synopsis

Abstract

Apparent pK‐values have been determined for 56 aromatic acids in the solvent system methylcellosolve (80 wt.‐ %)/water (20 wt.‐ %) with a previously described fully automatic titration apparatus. The validity of the Hammett equation was tested and found to express the experimental data with a deviation comparable with data for aqueous systems. Reaction constants ϱ are given for the apparent pK‐values of phenols, benzoic acids, salicylic acids and benzene‐sulfonanilides in the solvent system mentioned. The additivity of the effects of aromatic suhstituents on the apparent pK‐values was tested and found to be comparable with the data for pK‐values measured in aqueous media.

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Zur Mikrotitration organischer Verbindungen. Teil III. Scheinbare Dissoziationskonstanten von Dicarbonsäuren in den Systemen Methylcellosolv/Wasser und Dimethylformamid/Wasser

✍ W. Simon; Doris Meuche; E. Heilbronner 📂 Article 📅 1956 🏛 John Wiley and Sons 🌐 German ⚖ 768 KB

## Abstract It is shown that the determination of apparent pK‐values of aliphatic dicarboxylic acids in the nonaqueous solvent systems methylcellosolve/water and dimethylformamide/water by a previously described micromethod yields thermodynamically undefined values, which however show the same rela