Equilibria of CO2 Related Species in Aqueous Solution

Thermodynamic equilibria of CO2 related species in aqueous media are important in CO2 chemistry, and are summarized briefly as follows. An equilibrium of gaseous CO2 with HCO3 is 

The pH is determined by [COs / HCO3 ] with K 2 tire equihbrium constant of tlie reaction (10), 

The pH values for equihbrium (7) in given [HCO3 ] solutions under P(CO2) 1 atm are presented in Table 1 as estimated from Eq. (9). Table 2 tabulates pHs and partial pressures of CO2 for solutions in equilibrium (10), calculated from Eqs. (11) and (12) for given [CO32 ]/[HCO3 ] and IHCO3 ]. Activity coefficient of 

Values of pH of Solutions of Given Aetivity [HCO3 I under /XCO2) = 1 atm 

HCO3 /(HCOa ) is related with the activity [HCO3 ] and the concentration C(HCO3 ), 

---