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ERIC Number: EJ1002728
Record Type: Journal
Publication Date: 2012-Sep
Pages: 3
Abstractor: As Provided
Reference Count: 30
ISBN: N/A
ISSN: ISSN-0021-9584
Using Mole Ratios of Electrolytic Products of Water for Analysis of Household Vinegar: An Experiment for the Undergraduate Physical Chemistry Laboratory
Dabke, Rajeev B.; Gebeyehu, Zewdu
Journal of Chemical Education, v89 n9 p1198-1200 Sep 2012
A simple 3-h physical chemistry undergraduate experiment for the quantitative analysis of acetic acid in household vinegar is presented. The laboratory experiment combines titration concept with electrolysis and an application of the gas laws. A vinegar sample was placed in the cathode compartment of the electrolysis cell. Electrolysis of water generated OH[subscript -](aq) in the cathode compartment. Acetic acid in the vinegar sample was neutralized by electrolytically generated OH[subscript -](aq). Phenolphthalein was used as a visual indicator to detect the end point of the titration. The volume of O[subscript 2](g) produced at the anode was monitored. The amount of OH[subscript -](aq) produced at the cathode was determined from the volume of O[subscript 2](g) produced at the anode. The amount of acetic acid present in the sample was determined from the mole relationships between H[subscript +](aq), OH[subscript -](aq), and O[subscript 2](g). The concentration of acetic acid in household vinegar was determined to be 4.8%. The experimentally determined percentage of acetic acid was in agreement with the manufacturer's label and the volumetric titration results. The electrolysis cell was directly powered by a 9 V battery. Preparation of an electrolysis cell, experimental procedure, and results of the electrolytic titration are presented. (Contains 2 figures.)
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
Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A