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Ted Mooney, P.E. RET
Pine Beach, NJ

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Science experiment

My little sister is doing a science experiment for school. She put a penny in house hold bleach and now it is growing something under the penny. It's kinda like gluing the penny to the bottom of the dish that she out it in. Why is that and what is it doing. I know that one of the ingredients in bleach is sodium hypochlorite. If it having some reaction to the copper in the penny?

Deidre Richards
- Cincinnati, Ohio
2003

Bleach is sodium hypochlorite, NaOCl. Bleach is quite alkaline, and my suspicion would be that it is dissolving the zinc in the penny.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

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