Investigatory Project Essay

1207 Words Feb 12th, 2014 5 Pages

Greening School’s
Green Chemistry Lesson
Glue From Milk

1. Examine how a chemical reaction can change into a new product, 2. Understand how renewable resources can be used in our everyday lives

• • • • • • • • • • • • • 2 one-ounce medicine cups Safety goggles Plastic spoon (reuse) Basket-type coffee filter 2 9-once clear (reusable) plastic cups 3-quart package of powdered non-fat milk 1 ½ cups vinegar 8 ounce box of baking soda set of measuring spoons Measuring cup Hot water (1/3 – ½ cup) Plastic or newspaper (to cover table if necessary) Paper for gluing Towels for cleanup

Green Chemistry Principles
• • Safety first and last Use renewable resources

IL State Standards (Science)
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Separate the curd from the whey. To do this, line the clean, empty second cup with the coffee filter and pour the curd/whey mixture into the filter. 7. Lift the filter slowly. The liquid whey should drain through the filter, leaving only the curd. The curd is what you want to keep. 8. Squeeze the filter containing the curd to remove as much of the whey (liquid) as possible. Drop the lump of curd back into the plastic cup that you first used. [Dispose of the whey by pouring it down the sink.] 9. Use the spoon to break the curd into small pieces. [Breaking up the curd is important for making good glue.] 10. Add one teaspoon of hot water and 1/8-1/4 teaspoon of baking soda to the chopped curd and mix thoroughly. You should see some slight foaming, a chemical reaction. Continue mixing until the curd becomes smoother and more liquid. The curd has now become glue. [If the mixture is too thick, add a few drops of water. If it is too lumpy, add another pinch of baking soda, and stir. You should see some foaming. Don’t be afraid to experiment by adding more water or baking soda to improve the consistency of your glue. The finished product can vary from a thick liquid to a thick paste. This depends on how much curd there is, and how much water and baking soda are used.] 11. Use glue to paste together pieces of paper. It may take 15-30 minutes to dry depending on how much you use, but it should work as well as traditional white school paste. 12. Cover cup of glue with plastic

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