ERIC Number: EJ1046280
Record Type: Journal
Publication Date: 2014-Nov
Abstractor: As Provided
Reference Count: 13
Turbidimetric Estimation of Alcohol Concentration in Aqueous-Alcohol Mixtures
Swinehart, William E.; Zimmerman, Bonnie L.; Powell, Kinsey; Moore, Stephen D.; Iordanov, Tzvetelin D.
Journal of Chemical Education, v91 n11 p1947-1950 Nov 2014
A concept of the turbidimetric method for determining the concentration of ethanol in water-ethanol mixtures is described. A closed sample cell containing the analyte was heated to achieve vapor saturation and subsequent condensation. As the condensation occurred, the decrease in percentage transmittance with time due to light scattering was measured at 540 nm. Measurements of a single sample were performed for a period of 300 s. The rate of decrease of percentage transmittance versus the concentration of water-ethanol standard solutions was used to generate a calibration curve. The technique demonstrates the use of light scattering for analytical applications and provides an opportunity to teach basic nucleation concepts.
Descriptors: Science Instruction, Scientific Principles, Water, Light, Chemistry, College Science, Undergraduate Study, Spectroscopy, Science Activities, Demonstrations (Educational), Hands on Science
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: firstname.lastname@example.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Authoring Institution: N/A