H2CO3 - CARBONIC ACID

Properties of carbonic acid:

In the free state it isn't allocated. There is in dilute solution at room temperature as hydrate CO2 • H2O, partially isomerized to H2CO3 (molecules of H2CO3 are also found in the gas phase). Weak acid, it is neutralized by alkalis with formation of sour and average salts.


Molar mass g/mol 62.02

Methods for preparation of carbonic acid:

CO2(solution) + H2O = CO2 • H2O(solution) = H2CO3(solution) (normal temp.).


Chemical reactions with carbonic acid:

H2CO3(solution) = CO2 + H2O (boiling).

H2CO3(diluted) + H2O(cold) = HCO3(-) + H3O(+),

HCO3(-) + H2O = CO3(2-) + H3O(+).

H2CO3 + NaOH(diluted) = NaHCO3 + H2O,

H2CO3 + 2NaOH(conc.) = Na2CO3 + 2H2O.

H2CO3 + Na2CO3 = 2NaHCO3.

H2CO3 + NH3 • H2O(conc.) = NH4HCO3 + H2O [impurity (NH4)2CO3].

H2CO3 + Ca(OH)2 = CaCO3↓ + 2H2O.

H2CO3 + CaCO3(solid) = Ca(HCO3)2(solution).


 

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