Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone

Autores
Madriz Ruiz, Lorean Mercedes; Cabrerizo, Franco Martín; Vargas, Ronald
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In this communication, a remote experimental activity in chemical kinetics is described, taking into account the quantification based on the optical sensor of a smartphone. The objective pursued herein is to equip students with the appropriate tools and strategies required to empirically determine the parameters of the rate law including reaction orders, rate constant (k), frequency factor (A), and activation energy (Eₐ). Typical results of the proposed protocol are shown and discussed in the framework of the bleaching reaction of food dye allura red (RD40) and hypochlorite, as a representative example. A graphical approach of the concentration vs time data measured under the experimental condition where [RD40] ≪ [ClO⁻] (isolation method) suggests a first-order kinetics with respect to the dye. In addition, the analysis of the pseudo-first-order constant (kobs) shows a first-order relationship with respect to ClO⁻. In addition, using the two-point form of the Arrhenius equation, values of 3.22 × 10⁷ s/M and 44.55 kJ/mol were obtained for A and Eₐ, respectively. Interestingly, all the kinetic parameters (reaction orders, k, A, and Eₐ) are on the same order of magnitude as those previously reported in the literature and acquired with more sophisticated and accurate equipment. This experience provides evidence that it is possible to proceed with remote experimental activities to deepen the collection and analysis of kinetic data during a pandemic.
Facultad de Ciencias Exactas
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Materia
Ciencias Exactas
Física
Química
Hands-On Learning/Manipulatives
Second-Year Undergraduate
Physical Chemistry
Kinetics
Rate Law
UV−Vis Spectroscopy
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/132657

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network_name_str SEDICI (UNLP)
spelling Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a SmartphoneMadriz Ruiz, Lorean MercedesCabrerizo, Franco MartínVargas, RonaldCiencias ExactasFísicaQuímicaHands-On Learning/ManipulativesSecond-Year UndergraduatePhysical ChemistryKineticsRate LawUV−Vis SpectroscopyIn this communication, a remote experimental activity in chemical kinetics is described, taking into account the quantification based on the optical sensor of a smartphone. The objective pursued herein is to equip students with the appropriate tools and strategies required to empirically determine the parameters of the rate law including reaction orders, rate constant (k), frequency factor (A), and activation energy (Eₐ). Typical results of the proposed protocol are shown and discussed in the framework of the bleaching reaction of food dye allura red (RD40) and hypochlorite, as a representative example. A graphical approach of the concentration vs time data measured under the experimental condition where [RD40] ≪ [ClO⁻] (isolation method) suggests a first-order kinetics with respect to the dye. In addition, the analysis of the pseudo-first-order constant (k<sub>obs</sub>) shows a first-order relationship with respect to ClO⁻. In addition, using the two-point form of the Arrhenius equation, values of 3.22 × 10⁷ s/M and 44.55 kJ/mol were obtained for A and Eₐ, respectively. Interestingly, all the kinetic parameters (reaction orders, k, A, and Eₐ) are on the same order of magnitude as those previously reported in the literature and acquired with more sophisticated and accurate equipment. This experience provides evidence that it is possible to proceed with remote experimental activities to deepen the collection and analysis of kinetic data during a pandemic.Facultad de Ciencias ExactasInstituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas2021-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf2117-2121http://sedici.unlp.edu.ar/handle/10915/132657enginfo:eu-repo/semantics/altIdentifier/issn/0021-9584info:eu-repo/semantics/altIdentifier/issn/1938-1328info:eu-repo/semantics/altIdentifier/doi/10.1021/acs.jchemed.0c01427info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:31:48Zoai:sedici.unlp.edu.ar:10915/132657Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:31:48.398SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
title Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
spellingShingle Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
Madriz Ruiz, Lorean Mercedes
Ciencias Exactas
Física
Química
Hands-On Learning/Manipulatives
Second-Year Undergraduate
Physical Chemistry
Kinetics
Rate Law
UV−Vis Spectroscopy
title_short Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
title_full Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
title_fullStr Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
title_full_unstemmed Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
title_sort Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
dc.creator.none.fl_str_mv Madriz Ruiz, Lorean Mercedes
Cabrerizo, Franco Martín
Vargas, Ronald
author Madriz Ruiz, Lorean Mercedes
author_facet Madriz Ruiz, Lorean Mercedes
Cabrerizo, Franco Martín
Vargas, Ronald
author_role author
author2 Cabrerizo, Franco Martín
Vargas, Ronald
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Física
Química
Hands-On Learning/Manipulatives
Second-Year Undergraduate
Physical Chemistry
Kinetics
Rate Law
UV−Vis Spectroscopy
topic Ciencias Exactas
Física
Química
Hands-On Learning/Manipulatives
Second-Year Undergraduate
Physical Chemistry
Kinetics
Rate Law
UV−Vis Spectroscopy
dc.description.none.fl_txt_mv In this communication, a remote experimental activity in chemical kinetics is described, taking into account the quantification based on the optical sensor of a smartphone. The objective pursued herein is to equip students with the appropriate tools and strategies required to empirically determine the parameters of the rate law including reaction orders, rate constant (k), frequency factor (A), and activation energy (Eₐ). Typical results of the proposed protocol are shown and discussed in the framework of the bleaching reaction of food dye allura red (RD40) and hypochlorite, as a representative example. A graphical approach of the concentration vs time data measured under the experimental condition where [RD40] ≪ [ClO⁻] (isolation method) suggests a first-order kinetics with respect to the dye. In addition, the analysis of the pseudo-first-order constant (k<sub>obs</sub>) shows a first-order relationship with respect to ClO⁻. In addition, using the two-point form of the Arrhenius equation, values of 3.22 × 10⁷ s/M and 44.55 kJ/mol were obtained for A and Eₐ, respectively. Interestingly, all the kinetic parameters (reaction orders, k, A, and Eₐ) are on the same order of magnitude as those previously reported in the literature and acquired with more sophisticated and accurate equipment. This experience provides evidence that it is possible to proceed with remote experimental activities to deepen the collection and analysis of kinetic data during a pandemic.
Facultad de Ciencias Exactas
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
description In this communication, a remote experimental activity in chemical kinetics is described, taking into account the quantification based on the optical sensor of a smartphone. The objective pursued herein is to equip students with the appropriate tools and strategies required to empirically determine the parameters of the rate law including reaction orders, rate constant (k), frequency factor (A), and activation energy (Eₐ). Typical results of the proposed protocol are shown and discussed in the framework of the bleaching reaction of food dye allura red (RD40) and hypochlorite, as a representative example. A graphical approach of the concentration vs time data measured under the experimental condition where [RD40] ≪ [ClO⁻] (isolation method) suggests a first-order kinetics with respect to the dye. In addition, the analysis of the pseudo-first-order constant (k<sub>obs</sub>) shows a first-order relationship with respect to ClO⁻. In addition, using the two-point form of the Arrhenius equation, values of 3.22 × 10⁷ s/M and 44.55 kJ/mol were obtained for A and Eₐ, respectively. Interestingly, all the kinetic parameters (reaction orders, k, A, and Eₐ) are on the same order of magnitude as those previously reported in the literature and acquired with more sophisticated and accurate equipment. This experience provides evidence that it is possible to proceed with remote experimental activities to deepen the collection and analysis of kinetic data during a pandemic.
publishDate 2021
dc.date.none.fl_str_mv 2021-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/132657
url http://sedici.unlp.edu.ar/handle/10915/132657
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0021-9584
info:eu-repo/semantics/altIdentifier/issn/1938-1328
info:eu-repo/semantics/altIdentifier/doi/10.1021/acs.jchemed.0c01427
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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