Finding the p"K"[subscript a] Values of a Double-Range Indicator Thymol Blue in a Remote Learning Activity

Autor/inn/en	Yimkosol, Warangkana; Dangkulwanich, Manchuta
Titel	Finding the p"K"[subscript a] Values of a Double-Range Indicator Thymol Blue in a Remote Learning Activity
Quelle	In: Journal of Chemical Education, 98 (2021) 12, S.3930-3934 (5 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Dangkulwanich, Manchuta)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
DOI	10.1021/acs.jchemed.1c00122
Schlagwörter	Chemistry; Science Instruction; Teaching Methods; Laboratory Experiments; Scientific Concepts; COVID-19; Pandemics; Color; Measurement; Spectroscopy; Light; Distance Education + Suchen Sie Ihr Suchwort? Chemie; Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Teaching method; Lehrmethode; Unterrichtsmethode; Laboratory work; Laborarbeit; Colour; Farbbezeichnung; Farbe; Messverfahren; Spektroskopie; Licht; Distance study; Distance learning; Fernunterricht
Abstract	Colorful transitions of various acid-base indicators have been used to illustrate the concept of chemical equilibria, especially in spectrophotometric determination of the equilibrium constants or pKa values. To accommodate an online laboratory environment necessitated by the COVID-19 pandemic, this work employs color analyses from digital images to determine the p"K"[subscript a] values of a double-range indicator thymol blue. The experiment has been developed into an online activity to teach chemical equilibria and dissociation of a diprotic acid. The p"K"[subscript a1] and p"K"[subscript a2] values determined by students are in good agreement with the literature values at 1.60 ± 0.05 and 8.70 ± 0.06, respectively. The results demonstrate a powerful application of RGB color analyses in determination of the p"K"[subscript a] values of thymol blue without access to spectrophotometers. (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