Originally Posted by MikeVega

That's what i figured .. I recalled something like that in like 5th grade .. ... the first 2 days it produced a good amount of Hydrogen and you could smell it .. then it seemed to stop producing the gas and just got dark red really fast ... pretty cool

I just looked it up and found this fun little trick I'll do with my son

1. Clean a penny: place a penny in vinegar--becomes shiny as oxide on

surface reacts with acid and dissolves.

2. To show that copper is in the solution from #1, put 50 pennies in a cup

of vinegar and let stand all day or overnight. The next day, place iron

nail in solution. Iron metal reacts with copper ions in solution--copper

metal appears on nail.