# How can you determine anhydrides of acids and bases?

Mar 30, 2017

Well, the $\text{acid anhydride}$ is simply two equiv of the parent acid LESS a water molecule...........

#### Explanation:

And so acetic anhydride is the anhydride of 2 equiv of acetic acid:

$\text{2H"_3"CC(=O)(OH)"rarr"H"_3"CC(=O)(O)C(=O)(CH"_3) + "H"_2"O}$

And the $\text{base anhydride}$ is an older term that is used in inorganic chemistry; i.e. it refers to 2 equiv of the hydroxide LESS water:

$2 N a O H \rightarrow N {a}_{2} O + {H}_{2} O$

$\text{Natrium oxide}$ is the base anhydride of $\text{sodium hydroxide}$.