Designing, Constructing, and Using an Inexpensive Electronic Buret

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• 作者：Tingting Cao ; Qing Zhang ; Jonathan E. Thompson
• 刊名：Journal of Chemical Education
• 出版年：2015
• 出版时间：January 13, 2015
• 年：2015
• 卷：92
• 期：1
• 页码：106-109
• 全文大小：211K
• ISSN：1938-1328

文摘

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鈥檚 plunger is actuated manually by the device鈥檚 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鈥揵ase 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.