# What s the covalent compound formula for oxalic acid?

For $\text{oxalic acid, } {C}_{2} {H}_{2} {O}_{4}$?
$\text{Oxalic acid}$ is the simplest dicarboxylic acid, $H O \left(O =\right) C - C \left(= O\right) O H$; its salts are called $\text{oxalates}$, i.e. ${C}_{2} {O}_{4}^{2 -}$, which is a chelating ligand. In the laboratory it is often used as the $\text{dihydrate}$, ${C}_{2} {H}_{2} {O}_{4} \cdot 2 {H}_{2} O$.