What would be a good hyothesis for this Lab? Procedure 1. Label five beakers as

Question

What would be a good hyothesis for this Lab?

Procedure

1. Label five beakers as copper gluconate, tin sulfate, aluminum sulfate, iron sulfate, and zinc sulfate.

2. Measure and pour 25 mL of each fluid into the corresponding beaker. Be sure to rinse the graduated cyl-

inder before measuring out a new solution.

3. Sort each of the following metal strips by chemical element: copper, tin, aluminum, iron and zinc.

4. Lightly sand each metal strip down with sand paper to remove the oxidized layer. Set the strips aside.

5. Use scissors to cut the filter paper into five strips. Each strip should measure 20 mm (2 cm) x 150 mm (15

cm).

Note:

When your electrochemical cell apparatus is set-up, each strip should be long enough to con-

nect the electrolyte solutions in the two adjacent beakers (half-cells).

6. Pour 25 mL of potassium chloride solution into a 100 mL beaker. Place the filter paper strips into the

beaker. Allow the strips to soak for approximately five minutes. This process creates the salt bridge.

7. Place the metal copper strip in the copper gluconate beaker, allowing it to lean against the side of the

beaker.

8. Repeat Step 7 for each of the metal strips and the corresponding beakers.

9. Place one of the potassium chloride soaked filter papers between the copper gluconate solution and the

tin sulfate solution so that the filter paper is immersed in both solutions simultaneously.

10. Assemble the 7-Function Multi-Meter by firmly pressing the positive (red)

Test Lead into the VmA (center) jack. Press the negative (black) Test

Lead into the COM (bottom) jack. Rotate the red, center dial until it is

pointing towards the DCV 2000 m position (hint, this position is similar to

the northwest position on a compass. Refer to Figure 4 for reference.)

2000 m is equal to 2 volts. Turn the multi-meter on.

11. Place the negative (black) multi-meter probe into the copper gluconate

solution, and the positive (red) multi-meter probe into the tin sulfate solu-

tion. Be sure not to touch the probe to the metal plate in the solution.

Note:

The negative probe should be placed in the copper gluconate electrolyte solution for all of the

half-cell apparatuses. The positive probe should be placed in the remaining electrolyte solution (tin

sulfate, aluminum sulfate, etc.)

12. Measure the voltage differential created between the two half-cells.

13. Discard the salt bridge, and repeat Steps 9 -12 three more times using the aluminum sulfate solution,

ferrous sulfate solution, and the zinc sulfate solution. Each solution should be paired with the copper glu-

conate solution, placing the negative probe of the volt meter in the copper gluconate solution each time.

A new salt-bridge should be used for each electrochemical cell.

Explanation / Answer

It is practical laboratory problem this experiment should be done then reported.

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