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!