Resumen de Designing, Constructing, and Using an Inexpensive Electronic Buret
Tingting Cao, Qing Zhang, Jonathan E. Thompson
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.
