Monday, November 17, 2008
In class we had a demonstration of evaporation. The problem was to determine what happens to something that is mixed with water when the water evaporates. Does the stuff mixed in the water evaporate too?
I took water and added food coloring in one container and salt in the other. I heated the water and evaporated it out of the container. The students looked at the containers and noticed something was left behind. What does this mean? What was left behind?