Tuesday, July 27, 2010

Cleaning coins with Coca-Cola.

One of our latest experiments was to put
a dirty bronze coin into a cup of Coca-Cola.

The reaction that noticed was that when we took
the coin out of the Coca-Cola it was clean.

After discussing why we thought this happened (we came to the conclusion that one of the ingredients in the Coca-Cola dissolved the grime) we researched to find out that it is food acids (a medium strength acid called phosphoric acid) that 'eats' the grime, or bacteria, off the coin.

Due to the different metals used to make different coins,
this experiment may not always work.

You can watch this experiment being performed on the YouTube video below.

1 comment:

joe bray said...

good work room 2.

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