Carbonic Acid
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The common chemical formula for carbonic acid is H2CO3. It can also be represented as CO2(aq) + H2O ⇌ H2CO3.
Ka= [h+][HCO3-]/[H2CO3]
This is a double displacement reaction, where the sodium (Na) ion in NaHCO3 switches places with the hydrogen (H) ion in HC2H3O2 to form NaC2H3O2 and H2CO3.
H2CO3 is atype of ionization which depend on two steps as following :H2CO3 H+ + HCO3- HCO3- H+ + CO3-2
The full name of the acid H2CO3 is carbonic acid.