H3OH2O

H3OH2O is not a recognized chemical compound or standard notation in common chemical nomenclature. The string does not correspond to a single isolated molecule described in major databases, and its exact meaning is ambiguous. It appears to concatenate two familiar species—H3O and H2O—but as written it would be chemically inconsistent, since H3O+ (hydronium) carries a positive charge while H2O is neutral.

Possible interpretations are informal or context-specific. In aqueous chemistry, the proton in solution is described by hydrated protons and various protonated water clusters, such as H3O+, H5O2+ (the Zundel cation), and H9O4+ (the Eigen cation). A shorthand like H3OH2O might be used informally to suggest a hydration complex of a hydronium ion, for example H3O+(H2O)n, though this is not standard notation. Without explicit context, H3OH2O should not be treated as a defined chemical species.

Stability and occurrence: If such a form were to be encountered, it would more plausibly represent a transient association within a network of hydrogen-bonded water molecules in solution rather than a discrete, neutral molecule. In the gas phase, isolated neutral H3OH2O is not known as a stable species; protonated water networks dominate discussions of proton transport in many environments.

See also: Hydronium ion, Water (H2O), Proton transfer, Protonated water clusters.