Class: BE210
Group: R2
Members: FACILITATOR Vijay Rao, TIME & TASK KEEPER Cindy Wan, SCRIBE Cindy Wan, PRESENTER Jeff Discenza
Date: 5/11/00
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Abstract:

The two goals of this experiment were to determine the actual cell constant of the conductivity cells with precision better than 2.0% and use the calibrated cells to measure the resistances of different concentrations of KCl solutions with accuracy better than 3.0% at a constant temperature of 25?C.  The nominal values for the 3 conductivity cells were 10, 1.0, and 0.1 (cm-1) with an uncertainty of 20% and the actual cell constants were found to be 9.02±1.50%, 1.14±1.64%, and 0.107±1.37% (cm-1).  All three results were under the 2.0% precision mark.  Using the calibrated cells to measure the resistances of different concentrations of KCl solutions ranging from 100? to 100K?, the accuracy of the resistance measurements ranged from 1.29% for the 1.0 cell to 17.3% for the 0.1 cell.  Therefore, the goal of getting the accuracy of the resistance measurement within 3.0% was only achieved in part.