# Dehydration of carboxylic acids using P2O5

Why isn’t concentrated $\ce{H2SO4}$ used for the dehydration of carboxylic acids to anhydrides? What is special about $\ce{P2O5}$?

• OK, thanks. Now to the point: you may use H2SO4, but how would you separate it from your anhydrides? – Ivan Neretin Apr 26 '18 at 9:09
• well i dont know – amish dua Apr 26 '18 at 9:38
• The advantage of P2O5 is that it is solid. Also, it is a stronger dehydrating agent than H2SO4. – Ivan Neretin Apr 26 '18 at 9:44

$\ce{P2O5}$ is a solid. Hence, it is easy to separate from reaction products. Moreover, $\ce{P2O5}$ is a stronger dehydrating agent than $\ce{H2SO4}$