Project: Soap Fest
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| Materials needed. Half & Half is used here as substitute for Whole Milk. Use whole milk if you have it! Use any flat tray you have - a cookie sheet works great too. |
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| Pour enough half & half/whole milk to create a thin layer on the bottom of the tray. Use a few different food colorings and make 6-8 drops anywhere in the tray. |
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| Pour drops of dish soap onto the food coloring. If you're quick, try to hit multiple spots of food coloring! |
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| The initial spread is the most exciting. But continue to watch the dish soap drop and you will notice food coloring fizzing out of that circle for much longer! |
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| When the reaction stops, mix the colors for some fun. Wash tray in the sink when finished - DO NOT DRINK. |
Why does this happen? Let's think about Dish Soap. How does this liquid keep our dishes clean? More or less, it breaks down the fat molecules in food. Whole milk has.. lots of fat molecules. Try with reduced fat milk and you will see that this experiment doesn't really work.
As we pour the dish soap into the milk, the dish soap begins to break up the fat molecules in the milk. The food coloring doesn't add to the reaction, but allows us to see the reaction take place.
Experiment! Does the size of the tray matter? Are there dish soaps that do a better job than others?
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