Electrolysis BCE</h3>

Electrolysis BCE

Oklahoma State University

Be sure to enter your first name, last name and your school before clicking on the Submit button at the bottom of this page.

It is OK to use your textbook, but if you can answers the questions without your text that is OK too.

Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


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In this BCE we will investigate Electrolysis reactions in aqueous solution. Click on the Electrolysis link to open a new tab/browser window. The tab containing the BCE and the tab containing the Electrolysis simulation should be adjacent to each other so that it is easy to move between. In the Electrolysis window are three tabs displayed near the top-right portion of the screen. Use the mouse to select the Experiment tab, and then click on the Run Experiment button.

When the simulation is loaded build the following electrolytic cell:

1) Select Cu in the + Terminal dropdown menu;
2) Select Cu in the - Terminal dropdown menu;
3) Select Cu(NO3)2 in the Solution dropdown menu;
4) On the DC Ammeter use the mouse to move the Amps from 00.00 to 3.00;
5) On the DC Ammeter use the mouse to move the Timer (min) to about 20.00 min;
6) Click the On switch on the DC Ammeter.

Answer the following questions:

1a. For which electrode does the mass increase? (Choose one)

b. For which electrode does the mass decrease? (Choose one)

Click on the Microscopic View button and then click on the magnifying glass over the + electrode, and then on the magnifying glass over the - electrode.

c. What metal is plating out at the - electrode/terminal?

d. Account for the increase in mass at the

2. Setup the simulation as described in each of the Experiments below and click the On switch. When the time has run out record the CHANGE in amount at each terminal.

Table I:

 
Exp #1
Exp #2
1) + Terminal
Zn
Zn

2) - Terminal
Zn

Zn

3) Solution

Zn(NO3)2

Zn(NO3)2

4) Time (min)

10.00

10.00

5) Amps

3.00

2.00
6) Change in amount (g) at + Terminal
7) Change in amount (g) at - Terminal

 

3. Considering rows 1) through 5) describe how the two Experiments are similar and how do the two experiments differ?

4. How is the CHANGE in amounts at the - Terminal in the two experiments related to the variable you described in Question 3.

 

 

5. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

6. If there is one question you would like to have answered in lecture, what would that question be?