The Effect of Different Electrodes on Voltage in a Voltaic Cell
Purpose: To observe the voltage change in using different metals in the same constant solutions.
Variables:
- Dependent: The dependent variables are the use of different metals as electrodes. The different metals that are to be used in this experiment are Zinc, Copper, and Tin. Independent: The independent will be the voltage change of the voltaic cell. This data will be recorded in the data table.
- Controlled: The controlled variables will be:
- The solutions used as the two half cells, Cu2+ and Zn2+. - Using different solutions would present a need to test the effect they have on the voltage of the cell.
- The molarity of the two solutions- Using different molarities might potentially increase or decrease voltage.
- The volume of the two solutions- Increasing volume of the solutions would affect the surface area of the metal in contact with the solution which could possibly affect voltage.
- The solution used in the salt bridge- Different solutions may have an effect on voltage or ion movement.
- The same Voltmeter will be used throughout the experiment-Different Voltmeters could have different readings.
- The negative electrode will always be in the zinc (II) Solution and the positive electrode in the copper (II) solution. - Switching the electrodes would create a new variable to test.
