CHEMISTRY Electroplating and the Measuring of Avagadros Number

CHEMISTRY Electroplating and the Measuring of Avagadros Number

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William Pittman SID: 817000368 9/13/2007 Electroplating and the Measurement of Avogadro’s number Summary - In this experiment, we were to determine what would happen if a sample of tin and a sample of copper immersed in a liquid bath of tin ion solution. First we cleaned the two strips of metal with varying methods outlined in the lab notebook. After this, we filled a vessel with the tin ion solution and attached positive and negative leads to the strips of tin and copper respectively. We observed the results of what happened when the two strips were immersed in the bath without current flowing through them (nothing). We then applied current to the apparatus. The tin began to “plate” the copper strip and continued to do so until we halted the electric current. Results - Metal Mass Before Mass After(Cu+Sn) Deviation Cu .7525g .8445 +.092 Sn .4878 .4778 -.1 Avg current = .256 A Time = 300s
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Unformatted text preview: Calculations * = Avg current time Coulombs . * = 256 300 . 77 4 C ( / .-)* = # C 1 6e 19 2 electrons ( . / .-) * = 77 4 C 1 6e 19 2 . 9 675e20 electons # = ((# / ) * )) / Avagadros electrons 2 mm Sn Grams of Sn gained # = (( . / ) * . )) / . Avagadros 9 675e20 2 118 71 092 Avogadros #(as calculated) = .24195e23 Discussion Deviations in the tin lost and the amount of tin present adhered to the copper may be apparent because of tine lost during the weighing process, calculation error (decimal places taken when weighing), and tin lost in the solution during the electroplating process. Using the atomic weight of tin is a flaw in discovering Avogadros number. We would not know the atomic weight of tin if we did not know Avogadros number. Another experiment would have to be formulated in order to truly discover Avogadros number....
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This note was uploaded on 03/19/2011 for the course CHEM 107 taught by Professor Generalchemforeng during the Spring '07 term at Texas A&M.

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CHEMISTRY Electroplating and the Measuring of Avagadros Number

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