p-dimethylaminobenzaldehydrazone derivatives as indicators.

Samir M.  El-Medani; Nabila M.  El-Mallah

Author(s)

Samir M. El-Medani Chemistry Department, Faculty of Science, Cairo University, El-fayoum, Egypt

Nabila M. El-Mallah Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt

Abstract

Two hydrazones were subjected to study. The first hydrazone was the p-dimethylaminobenzaldehyde-benzoylhydrazone (DMB). This hydrazone was used to determine Cu2+ by spectrophotometric method. This method depends on the extraction of Cu-DMB complex in chloroform. Maximum absorption was attained at 440 nm at pH 7-10. The second hydrazone, p-dimethylaminobenzaldehyde-p-nitrophenylhydrazone (DMN) was tested as an acid-base indicator. DMN compound was studied in UV and visible regions at different pH-values. DMN compound was found to have two pKa values 3.31 and 9.1 DMN was tested as acid-base indicator. It gave satisfied results for (1) strong acid-strong base system (2) strong acid-weak base system (3) weak acid-strong base system. The result was found to have maximum error 2% with maximum standard deviation 1.59.

Publication Details

Page(s) 333-336

DOI DOI not available

Published Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 38, Issue: 9--10, Year: 1995

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