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The reaction of anhydrides with water is often very violent and exothermic (giving off a great deal of heat energy). Some examples of anhydrides and their reaction products with water include:
Get your water-reactive signs and labels at Safety Emporium.
See the links under Further Reading below for the preparation and reactivity of other anyhydrides.
The reaction to form sulfuric acid is one step in the reaction of sulfur oxide emissions to form "acid rain". The reaction to form acetic acid is used in certain silicone caulks, leading to the familiar smell of vinegar (vinegar is a 5% solution of acetic acid in water) while the caulk cures.
Note above that reaction of anhydrides can often be violent and exothermic. Plan experiments and emergency procedures to deal with such situations before beginning your work.
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