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Electrolytic Cells

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Purpose: To draw and completely analyze five electrolytic cells. Procedure: ... 2H2O 2Br- H2 Br2(l) 2OH- E0 = -1.50 v MTV = 1.50 v. e- e ... – PowerPoint PPT presentation

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Title: Electrolytic Cells


1
Electrolytic Cells Lab Lesson 10
2
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
3
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons Significance
e-
e-
C
C

-
4
1. KBr(aq) electrolytic cell with
phenolphthalein. . Cathode Anode Observa
tions Significance
e-
e-
C
C

-
K Br- H2O
5
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons Significance
e-
e-
C
C

-
K Br- H2O
6
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles Significance
e-
e-
C
C

-
K Br- H2O
7
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles Significance
e-
e-
C
C

-
K Br- H2O
8
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink Significance
e-
e-
C
C

-
K Br- H2O
9
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink Significance
e-
e-
C
C

-
K Br- H2O
10
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance

e-
e-
C
C

-
K Br- H2O
11
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance

e-
e-
C
C

- Cathode Reduction
K Br- H2O
12
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance

e-
e-
C
C

- Cathode Reduction 2H2O2e- ? H2 2OH- -0.41v
K Br- H2O
13
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance
H2
e-
e-
C
C

- Cathode Reduction 2H2O2e- ? H2 2OH- -0.41 v
K Br- H2O
14
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance
H2 OH-
e-
e-
C
C

- Cathode Reduction 2H2O2e- ? H2 2OH- -0.41 v
K Br- H2O
15
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance
H2 OH-
e-
e-
C
C
Anode Oxidation
- Cathode Reduction 2H2O2e- ? H2 2OH- -0.41 v
K Br- H2O
16
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance
H2 OH-
e-
e-
C
C
- Cathode Reduction 2H2O2e- ? H2 2OH- -0.41 v
Anode Oxidation 2Br- ? Br2(l) 2e- -1.09 v
K Br- H2O
17
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance
H2 OH- Br2
e-
e-
C
C
- Cathode Reduction 2H2O2e- ? H2 2OH- -0.41 v
Anode Oxidation 2Br- ? Br2(l) 2e- -1.09 v
K Br- H2O
18
1. KBr(aq) electrolytic cell with
phenolphthalein. Cathode Anode Observati
ons bubbles pink yellow liquid Significance
H2 OH- Br2
e-
e-
C
C
Anode Oxidation 2Br- ? Br2(l) 2e- -1.09 v
- Cathode Reduction 2H2O2e- ? H2 2OH- -0.41 v
K Br- H2O
2H2O 2Br- ? H2 Br2(l) 2OH- E0 -1.50 v
MTV 1.50 v
19
2. Na2SO4(aq) electrolytic cell with Yamadas
Indicator. Cathode Anode Observations
pink bubbles orange
bubbles Significance
e-
e-
C
C

-
20
3. AgNO3(aq) electrolytic cell with Bromocresol
Green. Cathode Anode Observations
white metal yellow bubbles Significance
e-
e-
C
C

-
21
4. Pb(NO3)2(aq) electrolytic cell with thymol
blue. Cathode Anode Observations
solid metal red bubbles Significance
e-
e-
C
C

-
22
5. KI(aq) electrolytic cell with phenolphthalein
Starch. Cathode Anode Observations
pink bubbles black Significance
e-
e-
C
C

-
23
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.
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