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Dehydration (Formation of anhydrides).

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Dehydration (Formation of anhydrides).

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Formic anhydride is unknown, formic acid when dehydrated with conc. H2SO4 gives CO and H2O

\(HCOOH \xrightarrow {conc.\,H_2SO_4} CO+H_2O\)

Acid anhydrides can also be prepared by treating sodium salts of acids with acid halides.

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