Listening to pH

Autor/inn/en	Costa, Samuel C.; Fernandes, Julio C. B.
Titel	Listening to pH
Quelle	In: Journal of Chemical Education, 96 (2019) 2, S.372-376 (5 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Costa, Samuel C.) ORCID (Fernandes, Julio C. B.)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
DOI	10.1021/acs.jchemed.8b00641
Schlagwörter	Science Instruction; Scientific Concepts; Visual Impairments; Teaching Methods; Science Experiments; Educational Technology; Technology Uses in Education; Acoustics; Auditory Stimuli; Music + Suchen Sie Ihr Suchwort? Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Visual handicap; Sehbehinderung; Teaching method; Lehrmethode; Unterrichtsmethode; Unterrichtsmedien; Technology enhanced learning; Technology aided learning; Technologieunterstütztes Lernen; Akustik; Auditive Stimulation; Musik
Abstract	We developed a simple device to teach the concept of pH to visually impaired people through an experimental approach. An interface between a glass electrode and an open-source electronics platform based on easy-to-use hardware and software (Arduino Uno) was designed using an operational amplifier of ultralow input current. A headphone connected to digital output from Arduino Uno was employed to convert the electrical signals from pH to sound frequency. Using an audio file that emits sound frequencies, visually impaired students were trained to associate specific frequencies with pH values. There is a direct relationship between the logarithm of sound frequency from a given musical note and a pH value, which can be used to train students with low vision who would otherwise have difficulty observing pH values from visual indications. Sound frequency signals of 131-659 Hz that correspond to the piano musical scale of C[subscript 3], which is one octave below middle C (small octave or the "Do" note in solfège), to E[subscript 5], one octave above middle E (two-lined octave or "Mi" note in solfège), were used to obtain sounds for the pH scale. Each musical note from these scales corresponded to one pH value with precision of 0.5 unit. This proposed method can be easily implemented in a laboratory with a relatively low cost. (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	2020/1/01