We read about how acid in food makes it sour and how food can be pickled in vinegar to last longer. We conducted two experiment to see how acid works.
Experiment 1: The Penny
We placed a dirty penny in a cup and covered it with cola. 24 hours later, we removed the penny. It was markedly clearner although not entirely clean. Maybe it’s because we used caffeine free diet cola?? 
Experiment 2: The Cabbage
The boys placed red cabbage pieces in a pan of boiling water and then let it sit for an hour. They enjoyed sampling a few pieces as well.
The result was a smelly kitchen and lovely purple water…
The boys squeezed a lemon into the glass of purple water….
The purple immediately transformed to a hot pink!
