# What is the representation and used of H_2C=O?

Of $\text{methanal}$, i.e. $\text{formaldehyde}$?
$O = C {H}_{2}$. This has appreciable water solubility (approx. $40 \cdot g \cdot {L}^{-} 1$) and such solutions are known as $\text{formalin}$, which is widely used to preserve tissue in the undertaking caper.
$\text{Formaldehyde}$ has a normal boiling point of $- 19$ ""^@C. It is a quite unpleasant gas to get a whiff of.