Vanadametric estimation of hydroquinone and metol
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New procedures have been developed for the direct titrimetric estimation of hydroquinone by sodium vanadate, using diphenylbenzidine and N-phenylanthranilic acid as inside indicators.
The reaction between diphenylbenzidine or N-phenylanthranilic acid and the sodium vanadate proceeds rather slowly at the room temperature and is subject to retardation by quinone and quadrivalent vanadium salt. But it has been observed that the retardation is counteracted by the accelerating effect of oxalic acid. The optimum conditions of acidity and concentration of oxalic acid have been worked out to enable a satisfactory titration with any one of these indicators.
Procedures have also been developed for the direct volumetric determination of methyl-p-amino phenol sulphate (metol) with sodium vanadate using diphenylbenzidine and N-phenylanthranilic acid as inside indicators.
KeywordsSulphate Analytical Chemistry Phenol Inorganic Chemistry Titration
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