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- W289376049 abstract "Abstract A review of the theory of transition of acid-base and metallochromic indicators is presented with the emphasis laid on a unifying approach to the two important criteria of the indicator transition: the sharpness and the colour quality. The absorbance of the titration solution is expressed mathematically as a function characterizing the course of the titration and showing effects of influential parameters. After transformation into transmittance a matrix of values for the visible region of light is taken for the specification of the colour transition in the CLE. chromaticity systems. The indicator transition is thus characterized by the particular transition chromaticity curve. The rate of the colour change can be expressed by the sharpness of indicator transition, d a/ d V. Photometric titration curves thus provide necessary information for the investigation of colour transitions of chemical indicators. The choice of indicators is discussed taking into consideration the modes of visual end-point location used. The position of the indicator transition with respect to the equivalence point determines the applicability of the indicator. The subjective preference for colours of the indicator transition and the ability to remember a given colour change are important factors for the titrations by memory, whereas the perceptibility of the colour change expressed as an index represents a criterion allowing optimization of the titration arrangement (e.g. , to choose a suitable concentration of the indicator) and has a decisive influence on the visual error for titrations with a reference solution." @default.
- W289376049 created "2016-06-24" @default.
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- W289376049 date "1977-01-01" @default.
- W289376049 modified "2023-10-10" @default.
- W289376049 title "COLOUR CHANGES OF ION-COMBINATION INDICATORS" @default.
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- W289376049 doi "https://doi.org/10.1016/b978-0-08-021596-9.50031-6" @default.
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