Graduate Thesis Or Dissertation
 

The design and evaluation of a recording conductometric titrator

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/th83m154q

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  • A Heath EUW-20A Servo-Recorder was converted to a self-balancing, recording Wheatstone bridge. The EUW-20A 10000Ω slide-wire was used as the variable resistance arm of the bridge, the servo-amplifier was used as the bridge unbalance signal detector, and the servo-motor was used to balance the bridge automatically. The bridge was arranged to produce a readout directly proportional to the conductance of the measured element. The problems accompanying the measurement of electrolytic conductance with this instrument were identified. There are two major sets of problems: Those arising from adverse cell conditions involving stirring rate, electrolyte concentration and electrode condition, and those arising from cell capacitance associated with the ionic double-layer at the electrodes. The cell capacitance causes a phase difference between the a-c potentials of two of the bridge arms. This phase difference causes a significant dead band in the recorder response. Two sets of conductometric titrations of Na₂CO₃ with HC1 were performed, one using a sine wave to excite the bridge and one using a square wave. The error in the results obtained from these titrations was generally less than one percent and the reproducibility was one-half percent or less. The instrument performed satisfactorily when the conductance change occurring during the titration was as low as five percent.
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file details KnarrRichardD1967_Redacted.pdf 2017-08-04 Pubblico Scaricare