Determinação de parâmetros cinéticos em fluxo com câmara de gradiente e deteção espectrofotométrica: aplicação à reação entre o violeta de cristal e o ião hidróxido

Química Nova

António C. L. Conceição¹  Hermínio P. Diogo¹ 

[1] ,Universidade Técnica de Lisboa Instituto Superior Técnico Centro de Química EstruturalLisboa,Portugal

关键词: kinetics experiments;    gradient chamber;    crystal violet;   

DOI  :  10.1590/S0100-40422013000600029

来源: SciELO

【 摘 要 】

A didactic experiment is proposed aimed to extend the Flow Injection Analysis (FIA) based methodology to the area of physical chemistry/chemical reactors for undergraduate labs. Our prime objective was to describe the use of a gradient chamber for determination of the rate constant for the reaction between crystal violet and the hydroxide ion. The study was complemented by determining the effect of temperature on the rate constant. The kinetic parameters, activation energy and reaction rate constant are determined based on an assumption of rate orders. The main didactic advantages of the proposed experimental set-up are the use of less reagents, contributing to a more environmental friendly experiment. The experiment illustrates also the reduction of associated errors and time by using automated analysis owing to decreased operator manipulation.

【 授权许可】

CC BY-NC   
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