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Basic analytical chemistry: choosing a redox titration

In a previous article published in this Journal, equations that describe the theoretical curves of two different redox volumetric methods that can be used in the determination of iron in solution, namely cerimetry and permanganometry, were deduced. However, the literature describes that the standard...

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Bibliographic Details
Main Author: Andrade, João Carlos de
Format: Online
Language:Portuguese
Published: Universidade Estadual de Campinas 2021
Subjects:
Valoración redox
Elección del valorante
Punto final
Detección visual
Dicromatometría
Curva teórica
Determinación del hierro
Procedimiento en la práctica
Titulação redox
Escolha do titulante
Ponto final
Detecção visual
Dicromatometria
Determinação de ferro
Procedimento na prática
Redox titration
Choosing the titrant
The end point
The visual detection
Dichromatometry
Theoretical curve
Determination of iron
Procedure in practice
Online Access:https://econtents.sbu.unicamp.br/inpec/index.php/chemkeys/article/view/15992
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Summary:In a previous article published in this Journal, equations that describe the theoretical curves of two different redox volumetric methods that can be used in the determination of iron in solution, namely cerimetry and permanganometry, were deduced. However, the literature describes that the standard procedure adopted for this purpose is the titration of the iron sample with a standard solution of potassium dichromate, using visual detection, even knowing that dichromate has the lowest formal reduction potential of the three oxidizing agents considered. Hence, questions such as: what is the reason for the preference for potassium dichromate? Why use visual equivalence point detection? What are the recommended indicators? How to prepare sample and titrant for a redox titration? To answer these questions, in addition to knowing how the chemical system should behave, which is done through theoretical titration curves, it is also necessary to have a good practical knowledge of the chemistry involved in these procedures, which are determinants to accept the actions to be performed in the laboratory. For this, the analyst's previous experience is an essential factor. In this article, the essential points to be observed will be highlighted, before considering (or accepting) a procedure as adequate for the practice of redox volumetry.  
ISSN:2595-7430

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