Water Property Demo

I did a demonstration on pH in water. What I did was I set up four clear plastic cups and filled one cup each with plain yogurt, water, apple juice, and vinegar. The point I was making was that you can see if something is acidic according to how much it bubbles when you put a small spoonful of baking soda in the substance. It went really well and I think it was a good way to show how to measure acidity. 

I learned a few different things from watching the demos. I learned that oil sits on top of water because it's less dense. I learned that salt water is a solution. Salt water is more dense than regular water and is more conductive of electricity. And I also learned that a balloon filled with water has a higher specific heat than a balloon filled with air.