Monday, March 7, 2011
TITLE: EVAPORATION

Question: Do salt, water, or baking soda affect evaporation?

What you'll need to do this experiment:
4 glass jars, water, measuring cup, food scale, sugar, salt, baking soda, food coloring (if you want)

Procedure:
Label each jar (tap water, sugar, salt, and baking soda) Fill each jar with the same amount of water. You can add a drop of food coloring to each jar to help tell them apart.

Put 2 tablespoons of sugar into the sugar jar and stir till it dissolves.














Put 2 tablespoons of salt into the salt jar and stir till it dissolves.














Put 2 tablespoons of baking soda into the baking soda jar and stir till it dissolves.
The tap water jar will just have regular tap water in it with nothing mixed in. Add a drop of food coloring to each jar to make it easier (or more fun) to tell them apart. Make sure there is an exact amount of liquid in each jar by weighing the jars on a food scale. We weighed each jar empty and then with the liquid. The numbers on the scale show how many ounces are in each jar. As you can see, each jar has exactly the same amount of liquid.



































I will measure how much liquid is in each jar every day. Which one do you think will evaporate the fastest? My hypothesis is that the sugar water will evaporate the fastest. I don't know why, that's just what I think! Check back with me each day to see what is happening with my experiment!

1 comments:

Will said...

My guess is the tap water will evaporate the fastest.
I am thinking that since things like salt lower the freezing point of water (like when they put salt on the roads in winter), then putting things in water will also raise the evaporation temperature.