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.
Carbonic acid has the formula H2CO3. Each capital letter indicates a different element. Therefore, there are free different elements present: hydrogen, carbon and oxygen.
H2CO3 is not used as buffer.
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.