Science Project Summary:

Galvanic cells

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Difficulty: Advanced 7
Cost ($): 30
Time required:
1 hour to prepare, 1 hour for science fair project
Availability of materials:
Laboratory access and equipment required
Safety concerns:

Always handle chemicals with care. Safety gear (goggles, lab coats and gloves) should be worn when handling chemicals.

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This science fair project was done to find out the voltages that are obtained by using different combinations of metals in a Galvanic cell. The tests were done using copper, lead and zinc.
Procedure preview:
1.    For this science fair project, the independent variable is the type of metal electrodes and electrolyte solutions used. The dependent variable is the voltage produced by the Galvanic cell. This is measured using the digital voltmeter. The constants (control variables) are the amount of electrolyte solution, the size of the electrodes, the room temperature and the size of the salt bridge. 2.    The zinc, copper and lead plates are first cleaned. 3.    The 3 beakers are each filled with 300ml of zinc sulfide, copper sulfide and lead sulfide. The beakers are also labeled accordingly on the outside using the .....