Citrus Battery Contest


When two metals having different electrical potentials are placed in a solution of an electrolyte (such as a lemon or an orange,
with its high concentration of citric acid), a crude electrochemical cell is set up. The cell is a voltaic cell resulting from a spontaneous oxidation–reduction reaction.

The open-circuit potential difference between the reactions at each electrode is the cell potential, which can be measured with a digital voltmeter or a voltage sensor. The more active metal in a pair is usually the negative electrode (the anode). Magnesium, for example, which is the most active metal that was tested, always appears as the anode. (Aluminum is a significant exception to this general trend.) Significant bubbling is observed when magnesium is used as the electrode.

Click here for the complete activity



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.