the Site

World's top finishing resource since 1989
Chime right in - No login req'd

topic 29127

What is Citric acid


My experiment is to see which fruit produces the most voltage, using a copper and zinc nail, a multimeter, alligator clips, 3 lemons, 3 oranges, and 3 oranges. Part of the experiment includes research. I have heard that there is something called citric acid that helps produce the voltage. Could you explain what it is and what it has to do with the voltage?

Thank you.

Eric T.
student (grade 6) - Fullerton, California


Citric acid is the name of an acid found in citrus fruits, such as lemons, limes and oranges. The voltage you will get from the two nails will be due to something called the "electrode potential" of the individual metals. The electrode potential is a measurement of the reactivity of the metal in the acid.

Since part of your assignment is to do some research, I suggest you do some! Research is about experimenting, observing what happens and trying to understand it! This is what makes a good scientist and furthermore, it makes science bearable! If I didn't have the chance of doing experiments, I couldn't have thought of taking such a boring subject as science, but actually DOING things made it so much more exciting. For instance, many millions of people have wondered, over the centuries, what it would be like on the moon - Neil Armstrong was the first person to go there and find out; what a man!

Back to the assignment - try putting your nails into other things, such as potatoes, strawberries, tapwater, carbonated drinks, the earth, etc. See what happens and try to explain it.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA