Thursday, February 17, 2011

Shiny Pennies - Part 2

When Sarah found out that Jillian and Matthew had done a little science with pennies she wanted to try too!  So tonight after supper she mixed up the mixture (1/4 cup vinegar and 1 teaspoon table salt) and dropped in her dull pennies.

We talked a little more about how the vinegar and salt react to remove the copper oxide from the pennies.  Then we split the pennies into 2 groups.
Group A    rinsed the vinegar/salt solution off
Group B   let the vinegar/salt solution dry on the pennies

We went off to do Sarah's reading for about 1/2 hour and this is what we found when we came back!

Group A                    Group B

In Group B a chemical called malachite formed on the pennies and turned them a greenish-blue color!

Very Cool!

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