Acid anhydride
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Acid anhydrides are compounds that look like the dehydration product of an acid. Most commonly, they form the acid when mixed with water.
In organic chemistry, the acids involved are often carboxylic acids; for such cases, please see carboxylic anhydride.
For a typical mineral acid with formula HxEOy, the fully dehydrated compound has formula EOy-x/2 or E2O2*y-x.
table
| Acid | Oxide | |
| perchloric acid, HClO4 | dichlorine heptoxide, Cl2O7 | |
| chloric acid, HClO3 | dichlorine pentoxide, Cl2O5 | |
| sulfuric acid, H2SO4 | H2S2O7 | sulfur trioxide, SO3 |
| sulfurous acid, H2SO3 | H2S2O5 | sulfur dioxide, SO2 |
| nitric acid, HNO3 | dinitrogen pentoxide, N2O5 | |
| nitrous acid, HNO2 | dinitrogen trioxide, N2O3 | |
| phosphoric acid, H3PO4 | H4P2O7 | phosphorus pentoxide, P2O5 |
| phosphorous acid, H3PO3 | H4P2O5 | phosphorus trioxide, P2O3 |
| carbonic acid, H2CO3 | carbon dioxide, CO2 | |
| boric acid, H3BO3 | boron oxide, B2O3 |