GMU Set up Electrochemical Cells & Verifying Nernst Equation Lab Report

1. Complete the following calculations using the raw data from the data table and fill out the rest of the data table. SHOW ALL YOUR WORK FOR THE CALCULATIONS.

.– Ecell Standard for all cells

– Ecell Nernst for all cells

– Eox for all cells

– Ered for all cells

– % Error for all cells

2. Fill out data table

Data Table

Part A

Electrode 1 (Cathode) Reduction	Electrode 2 (Anode) Oxidation	Ecell (V) Measured	Eo cell, (V) Nernst	Eo cell(V) Standard
Ag (0.1M) (0.799V)	Zn (0.1M) (0.763V)	1.252
Ag	Cu (0.001M) (-0.337V)	0.361
Ag	Cu (0.01M)	0.382
Ag	Cu(0.1M)	0.47

Part B

Half Cell Reaction	Concentration	Eo Ox (V) Calculated	Eo red (V) Calculated	Eo red (V) Theoretical	Percent error
Cu2+ + 2e- à Cu	(0.001 M)			+0.339
Cu2+ + 2e- à Cu	(0.01 M)			+0.339
Cu2+ + 2e- à Cu	(0.1 M)			+0.339
Zn2+ + 2e- à Zn	(0.1 M)			-0.762

3. Include 1-5 sentences that briefly summarize the procedureand what information was obtained

? Example:– ____ g (or mL) of Reagent A were reacted with _____ g (or mL) ofReagent B until a precipitate formed/gas evolved/color changeoccurred. Observations were made and data were collected. Table 1represents _____. Table 2 represents _____. Figure 1 represents_____. Figure 2 represents ____.

*Table 1 and table 2 are the data tables.

4. Complete the discussion questions and be specific:

– Give a thorough interpretation of the results

-What is the purpose of the salt bridges? What wouldhappen if they were allowed to dry out?

– Describe the possible sources of error in yourmeasurements of cell potentials and how the potentialswould be affected by the error. Which parameter should be measured mostaccurately to obtain the best result? (Hint: Check Nernst equation)

– Is it possible to obtain the number of electrons required for the overall reaction from the slopeof the graph? How?

– What is the purpose of using the Nernst equation in this experiment?

5. Write a conclusion paragraph in the following format:

? Re-state the purpose of the experiment– For example: “The purpose of the experiment was to___________”

? How did you attempt to meet the purpose?– For example: “This was done by___________”

? Was the purpose met?– For example: “The purpose was/was not met and…”

? Was the actual outcome close to the anticipated outcome?– For example: “…the actual outcome was/was not near theanticipated outcome”

? Why or why not? What errors did you specifically experience inthis experiment?– For example: “The reason for the difference between theactual and anticipated outcomes is that during theexperiment errors A and B occurred…”

? What are some future improvements to this experiment?

Experiment pages 238-244 in lab manual