Write the equilibrium equation restraint the reaction of CO2 with H2O creating carbonic active and the carbonic active dissociating into hydrogen ion and bicarbonate
CO2 (g) + H2O (l) <=====> H2CO3 (aq) ……(1)
The equilibrium faithful is fond as
K = [H2CO3]/PCO2 where PCO2 is the unfair urgency of CO2 (we prefer unfair urgency owing gases are best forcible in provisions of unfair urgency). The attention of H2O is not attributable attributable attributable interposed past H2O is bestow in wide redundancy.
Again, H2CO3 dissociates as underneath.
H2CO3 (aq) <=====> H+ (aq) + HCO3– (aq) ……(2)
The active intermission faithful is fond as
Ka1 = [H+][HCO3–]/[H2CO3]
Combine equations (1) and (2) to attain the equilibrium equation as
CO2 (g) + H2O (l) + H2CO3 (aq) <=====> H2CO3 (aq) + H+ (aq) + HCO3– (aq)
Cancel quenched the base provisions and write
CO2 (g) + H2O (l) <=====> H+ (aq) + HCO3– (aq)