ERIC Number: EJ1050765
Record Type: Journal
Publication Date: 2015-Jan
Abstractor: As Provided
Reference Count: 20
Designing, Constructing, and Using an Inexpensive Electronic Buret
Cao, Tingting; Zhang, Qing; Thompson, Jonathan E.
Journal of Chemical Education, v92 n1 p106-109 Jan 2015
A syringe-based, electronic fluid dispenser is described. The device mechanically connects a syringe plunger to a linear slide potentiometer. As the syringe plunger moves, the electrical resistance between terminals of the potentiometer varies. Application and subsequent measurement of a DC voltage between the potentiometer pins is used to track the syringe plunger position and meter the volume dispensed. The syringe's plunger is actuated manually by the device's user. The dispensing device offers volumetric accuracy of better than 1% when the dispensed volumes were >10 mL. The device has been used for a traditional acid-base titration experiment and produced quantitative results indistinguishable from the conventional approach using a buret. The device is inexpensive, easy for students to understand, and simple to construct.
Descriptors: Science Instruction, Science Laboratories, Laboratory Equipment, Chemistry, Secondary School Science, High Schools, College Science, Undergraduate Study, Science Experiments, Accuracy, Student Surveys, Student Attitudes
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: email@example.com; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Secondary Education; High Schools; Higher Education; Postsecondary Education
Authoring Institution: N/A