lab 5 - n electrons n MnO 4-acidic neutral basic n Fe(CN 6...

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Zach Kmieciak Partners: Cassie, Tammi TA: CH Chem 112 October 17, 2007 Acid-Base Dependence of a Redox Reaction Introduction The purpose in this experiment was to show that the acid-base characteristics in a solution could cause a profound effect on the course of a redox reaction. This is shown through the transformation of potassium permanganate over several reactions. Data/Results Concentration of potassium permanganate - .01M Concentration of potassium ferrocyanide - .02 M Potassium permanganate titration Part 1 1st trial 2nd trial average initial 25.0 mL 15.11 mL final 15.11 mL 20.01 mL actual 9.89 mL 10.12 mL 10.005 mL Potassium permanganate titration Part 2 1st trial 2 nd trial average initial 25.0 mL 25.0 mL final 8.10 mL 9.80 mL actual 16.90 mL15.20 mL16.05 mL Potassium ferrocyanide titration Part 3 1st trial 2 nd trial average initial 25.0 mL 25.0 mL final 13.5 mL 12.5 mL actual 11.5 mL 12.5 mL 12.00 mL
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Calculations Calculations n Fe(CN) 6 4 - = [Fe(CM) 6 4 - ] * V Fe(CN) 6 4 - n MnO 4 - = [MnO 4 - ] * V MnO 4 - n electrons = n Fe(CN) 6 4- change in oxidation state of Mn =
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Unformatted text preview: - n electrons n MnO 4-acidic neutral basic n Fe(CN) 6 4 -0.000500 0.000500 0.00025 n electrons 0.000500 0.000500 0.00025 n MnO 4 -0.0001005 0.000162 0.000250 ∆ ox.state 4.975 3.086 1 Questions 1) The final oxidation state of the acidic solution was +2. The final oxidation state of the neutral solution was +4. The final oxidation state of the basic solution was +6. 2) MnO 4-+ 8H + + 5e-→ Mn 2+ + 4H 2 O MnO 4-+ 2H 2 O + 3e-→ MnO 2 MnO 4-+ e-→ MnO 4 2-+ 4OH-3) The formula of the basic product precipitated was Mn(OH) 2 . Conclusion The point of this experiment was to show that during acid/base reactions a change in oxidation state can occur and did. This is shown through a series of reactions that test the different reactions that give proof of this fact. This experiment is valid through the use of more than one trial, increasing the chance of an accurate result....
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