Open AccessSimultaneous multiwavelength study of thereaction of phenolphthalein with sodium hydroxide
Author(s) -
Kin Yip Tam,
Foo Tim Chau
Publication year - 1992
Publication title -
journal of analytical methods in chemistry
Language(s) - English
Resource type - Journals
eISSN - 2090-8873
pISSN - 2090-8865
DOI - 10.1155/s1463924692000294
Subject(s) - phenolphthalein , sodium hydroxide , principal component analysis , broyden–fletcher–goldfarb–shanno algorithm , photodiode , hydroxide , chemistry , sodium , analytical chemistry (journal) , chromatography , materials science , computer science , inorganic chemistry , mathematics , optoelectronics , organic chemistry , statistics , computer network , asynchronous communication
A photodiode array (PDA) spectrophotometer was used to study the fading reaction of phenolpthalein in dilute sodium hydroxide solution. The principal component analysis (PCA) method was employed to identify the number of light absorbing species in the kinetics system. The target factor analysis (TFA) procedure, coupled with the Broyden-Fletcher-Goldfard-Shanno (BFGS) optimization method, was applied to the observed data to deduce the rate constants and the concentration-time profile of the reaction. The internal referencing method was shown to be essential in improving the quality of data obtained by a single beam PDA spectrophotomer.
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