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

Autor/inn/en	Madriz, Lorean; Cabrerizo, Franco M.; Vargas, Ronald
Titel	Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone
Quelle	In: Journal of Chemical Education, 98 (2021) 6, S.2117-2121 (5 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Madriz, Lorean) ORCID (Cabrerizo, Franco M.) ORCID (Vargas, Ronald)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
DOI	10.1021/acs.jchemed.0c01427
Schlagwörter	Chemistry; Kinetics; Science Activities; Distance Education; Science Experiments; Optics; Measurement Equipment; Handheld Devices; Scientific Concepts; Data Collection; Pandemics + Suchen Sie Ihr Suchwort? Chemie; Kinetik; Distance study; Distance learning; Fernunterricht; Optik; Messinstrument; Data capture; Datensammlung
Abstract	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 (E[subscript a]). 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[superscript -]] (isolation method) suggests a first-order kinetics with respect to the dye. In addition, the analysis of the pseudo-first-order constant (k[superscript obs]) shows a first-order relationship with respect to ClO[superscript -]. In addition, using the two-point form ofthe Arrhenius equation, values of 3.22 × 10[superscript 7] s/M and44.55 kJ/mol were obtained for A and E[subscript a], respectively. Interestingly, all the kinetic parameters(reaction orders, k, A, and E[subscript a]) 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. (As Provided).
Anmerkungen	Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01