LAB 27 - syikin - Experiment 27 Conductance Behavior of...

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Unformatted text preview: Experiment 27 Conductance Behavior of Strong Electrolytes Abstract The equivalent conductance was found out by measuring resistance of solutions of strong electrolytes using a microprocessor based ratiometric conductivity measurement. Equivalent conductance at infinite dilution was found out to be 1 2 1 0005 . 0423 .-- Ω ± eq m . Then, using the moving boundary method, the transference number of hydrogen ion was calculated to be 005 . 819 . ± and the transference number of chloride ion was 005 . 181 . ± . Using the same method, ion mobilities of both hydrogen and chloride ion was calculated to be s V m ⋅ × ±- 2 7 10 ) 03 . 29 . 3 ( and s V m ⋅ × ±- 2 7 10 ) 023 . 726 . ( respectively. Introduction The objective of the first part of this experiment was to obtain equivalent conductance for different concentrations of Hydrochloric Acid ranging from about 0.1 to 0.001 M by measuring their resistances. However, the cell constant must be determined first. This was done by measuring the resistance of 0.02000 M potassium chloride (KCl). The second part of this experiment was done to obtain the transference numbers and the ion mobilities of hydrogen ion and chloride ion. Moving boundary method was 1 employed in the second part of the experiment using 0.1 M hydrochloric acid containing methyl violet indicator. 2 Data and calculations Part A: Resistance measurements Concentration (M) Resistance (Ω) Average Error Run 1 2 3 4 5 6 Water 980600 1250000- KCL 0.0200 438.9 438.9 438.9 438.9 438.9 438.9 438.9 0.4389 HCL 0.1019 30.74 30.73 30.73 30.73 30.73 30.73 30.73 0.03073 0.0509 60.25 60.24 60.25 60.24 60.24 60.24 60.24 0.06024 0.0255 115.5 115.5 115.5 115.5 115.5 115.5 115.5 0.11550 0.0102 290.3 290.3 290.2 290.2 290.2 290.2 290.2 0.29023 0.00509 575.5 575.5 575.4 575.3 575.3 575.3 575.4 0.57538 0.00204 1427 1427 1427 1427 1427 1426 1426.8 1.42683 0.00102 2840 2840 2840 2840 2840 2840 2840 2.84000 Table 1. Resistance for various solution and concentrations. The temperature of the water bath was on average 24.77 ºC. Error for resistance is taken as 0.1% of the average. Calculation of cell constant, k. R k ⋅ = κ where κ = Specific Conductance R = Resistance Specific conductance, κ, of 0.02000 M KCl can be obtained from plotting a graph from data given in Appendix C of the manual. κ ( Sm-1 ) Temperature ( o C) 0.2749 24.7 0.2754 24.8 0.276 24.9 0.2765 25 0.2771 25.1 0.2776 25.2 Table 2 . Data from Appendix C Figure 1 .Plot of specific conductance vs temperature 3 y = 0.0055x + 0.1401 0.2745 0.275 0.2755 0.276 0.2765 0.277 0.2775 0.278 24.6 24.7 24.8 24.9 25 25.1 25.2 25.3 Temperature ( o C) κ (Sm-1 ) From the graph, the equation for κ is 1401 . 0055 . + × = T κ where κ = specific conductance T = temperature of water bath in ºC So, 1-1 0.276 1401 . 8 . 24 0055 ....
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This note was uploaded on 03/27/2008 for the course CHEM 563 taught by Professor Woods during the Spring '08 term at University of Wisconsin.

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LAB 27 - syikin - Experiment 27 Conductance Behavior of...

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