Developments in indicators.
The use of metal ion-metallochromic indicator complexes as narrow-range pH indicators is shown to be advantageous for the titration of weak acids in aqueous media. The Cu-DBAH and the Mg-Azo Violet complexes with apparent pK values of 7.7 and 11.5 have been used for the titrations of benzoic acid and of glycine and phenol, respectively, with good precision.
Légrádi
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Nitrokémia Works Füzfögyártelep Hungary.