No.
Hydrogen, carbon and oxygen are the elements found in H2CO3
Carbonic acid H2CO3
H2CO3 = Carbonic acid It is made by dissolving Carbon dioxide into Water. H2O + CO2 ----> H2CO3
Hydrogen carbonate is a compound, not an element, and it therefore has a formula, not a symbol: H2CO3.
h2co3 (aq)--> co2+ h2o
CO2 and H2O combine to form H2CO3. There isn't any balancing to be done, really.
H2CO3 is not used as buffer.
Carbonic acid has the formula H2CO3. Each capital letter indicates a different element. Therefore, there are free different elements present: hydrogen, carbon and oxygen.
The common chemical formula for carbonic acid is H2CO3. It can also be represented as CO2(aq) + H2O ⇌ H2CO3.
The conjugate base of H2CO3 is HCO3-. When H2CO3 donates a proton, it forms the bicarbonate ion (HCO3-), resulting in the conjugate base of the acid.
Mg + H2CO3 = MgCO3 + H2
Acids, HNO3 (nitric acid) and H2CO3 (carbonic acid) are acids.