^^CO3^-- HCO3^- Carbonati.

Carbonated water - Wikipedia, the free encyclopedia

CO2				Carbon dioxide
CO
H2CO3			acido carbonico
CO3--				ione carbonato carbonate ion
HCO3-				ione bicarbonato hydrogen carbonate
Na2CO3			Carbonato di sodio Sodium carbonate soda Solvay ?  "soda" or "natron"
K2CO3			potash potassa carbonato di potassio
NaHCO3				bicarbonato di sodio, o idrogenocarbonato di sodio
KHCO3				bicarbonato di potassio

Struttura dello ione carbonato

The Lewis structure of the carbonate ion has two (long) single bonds to negative oxygen atoms, and one short double bond to a neutral oxygen Simple, localised Lewis structure of the carbonate ion.

This structure is incompatible with the observed symmetry of the ion, which implies that the three bonds are equally long and that the three oxygen atoms are equivalent. As in the case of the isoelectronic nitrate ion, the symmetry can be achieved by a resonance between three structures. This resonance can be summarized by a model with fractional bonds and delocalized charges:

Sodium bicarbonate or sodium hydrogen carbonate