Synthesis of guncotton |
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SAFETY -NOTE, THE PREPARATION OF GUNCOTTON MUST BE DONE IN A FULLY FUNCTIONAL FUMEHOOD You
will need: THIS MUST BE DONE IN A FUMEHOOD Pour 30 ml of concentrated sulfuric acid in a 200 ml beaker. Cool the sulfuric acid by placing the beaker in ice cold water. Now slowly add 30 ml of nitric acid. Mixing the acids produces a great deal of heat.
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Place a small amount of cotton
wool, as seen in the video below, in the acid mixture until it is completely submerged. Allow the cotton
wool to stand for 15 minutes. Click
to see the reaction. This sample of guncotton, shown in the video, was
not completely dry and therefore the reaction was not complete with solid
products left unreacted. |
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Compare the products of guncotton
with the products of conventional cotton burning. How is the rate of burning different.burning. |
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Chemical reactions produce products with totally new properties than the reactants. Consider the video on the right. It shows normal cellulose cotton wool on the left and cellulose cotton wool after it has been bathed in concentrated sulfuric and nitric acids. Describe the differences? |
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The video on the right shows how energetic the reaction between guncotton and atmospheric oxygen is. Notice how quickly the reaction takes place and how little residue is left in the solid state. |
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Safety notes
Mixing of acids is highly exothermic
(gives off heat). |
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