Abstract
The spectrophotometric characteristic and acid-base properties of pyrogallol red and bromopyrogallol red in the absence and presence of quaternary ammonium salts are described. The presence of quaternary ammonium salts changes the dissociation of reagent to a more acid region. The bathochromic shift of absorption spectra of PR and BPR is dependent on the length of the hydrocarbon radical but is strongly dependent on the hydrophilic group of quaternary ammonium salt.
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