Electrolytic Cells Lab Lesson 10.

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Presentation transcript:

Electrolytic Cells Lab Lesson 10

Electrolytic cell Lab Dec 17, 2008 Full Name Purpose: To draw and completely analyze five electrolytic cells. Procedure: 1. Fold a filter paper and place in a watch glass 2. Add 20 mL of electrolyte 3. Immerse the carbon electrodes in the electrolyte to complete the electrolytic cell. Data:

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: Significance: Power Source - + e- e- C C - +

1. KBr(aq) electrolytic cell with phenolphthalein. . Cathode: Anode: Observations: Significance: Power Source - + e- e- C C - + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: Significance: Power Source - + e- e- C C - + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles Significance: Power Source - + e- e- C C - + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles Significance: Power Source - + e- e- C C - + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink Significance: Power Source - + e- e- C C - + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink Significance: Power Source - + e- e- C C - + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: Power Source - + e- e- C C - + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: Power Source - + e- e- C C - Cathode Reduction + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: Power Source - + e- e- C C - Cathode Reduction 2H2O+2e- → H2+ 2OH- -0.41v + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: H2 Power Source - + e- e- C C - Cathode Reduction 2H2O+2e- → H2+ 2OH- -0.41 v + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: H2 OH- Power Source - + e- e- C C - Cathode Reduction 2H2O+2e- → H2+ 2OH- -0.41 v + K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: H2 OH- Power Source - + e- e- C C - Cathode Reduction 2H2O+2e- → H2+ 2OH- -0.41 v + Anode Oxidation K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: H2 OH- Power Source - + e- e- C C - Cathode Reduction 2H2O+2e- → H2+ 2OH- -0.41 v + Anode Oxidation 2Br- → Br2(l) + 2e- -1.09 v K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: H2 OH- Br2 Power Source - + e- e- C C - Cathode Reduction 2H2O+2e- → H2+ 2OH- -0.41 v + Anode Oxidation 2Br- → Br2(l) + 2e- -1.09 v K+ Br- H2O

1. KBr(aq) electrolytic cell with phenolphthalein. Cathode: Anode: Observations: bubbles pink yellow liquid Significance: H2 OH- Br2 Power Source - + e- e- C C - Cathode Reduction 2H2O+2e- → H2+ 2OH- -0.41 v + Anode Oxidation 2Br- → Br2(l) + 2e- -1.09 v K+ Br- H2O 2H2O+ 2Br- → H2+ Br2(l) + 2OH- E0 = -1.50 v MTV = +1.50 v

2. Na2SO4(aq) electrolytic cell with Yamada’s Indicator. Cathode: Anode: Observations: pink bubbles orange bubbles Significance: Power Source - + e- e- C C - +

3. AgNO3(aq) electrolytic cell with Bromocresol Green. Cathode: Anode: Observations: white metal yellow bubbles Significance: Power Source - + e- e- C C - +

4. Pb(NO3)2(aq) electrolytic cell with thymol blue. Cathode: Anode: Observations: solid metal red bubbles Significance: Power Source - + e- e- C C - +

5. KI(aq) electrolytic cell with phenolphthalein & Starch. Cathode: Anode: Observations: pink bubbles black Significance: Power Source - + e- e- C C - +

Conclusion State that you did what you set out to do in the purpose. Define an electrolytic cell. Do I need to say, do not use pronouns, Navreen? Start with the main rule and describe how you would completely analyze an electrolytic cell- use your notes, don't be a hero! Discuss how you determined the anode, cathode, site of oxidation, and site of reduction. Discuss electron flow and ion migration. Describe how you determined the anode and cathode reaction and include a discussion of the overpotential effect for water. Describe what electrolytic cells are used for and list all of the chemicals produced in this lab.