Study of semicarbazones and thiosemicarbazones derived from 1,2-naphthoquinone, as acid-base indicators: Evaluation of their transition limits through the chromaticity co-ordinates.
The use of 1,2-naphthoquinone-2-semicarbazone, 1,2-naphthoquinone-2-semicarbzone-4-sulphonic acid and 1,2-naphthoquinone-2-thiosemicarbazone-4-sulphonic acid as acid-base indicators has been studied. The sharpness of the indicator transitions has been investigated by means of photometric titrations and the colour quality specified with the aid of the CIE chromaticity system. The results show that the three substances are satisfactory as neutralization indicators.
Izquierdo
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Department of Analytical Chemistry, University of Barcelona, Barcelona, Spain.
Bosch
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E
Rodrigo
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