Another important factor is the effect of CO2 partial pressure. Under the conditions set in Figure formation both exhibit a capture capacity ratio of 2 to 1, while carbonate formation yields a 1 to 1 ratio. In the context of the interplay between nucleophilicity-swing and pH-swing mechanisms, one can see that for the molecules where 𝐾 𝐴𝑄_𝑎𝑑𝑑𝑢𝑐𝑡 is strong (e.g., 10 22 𝑀 -2 ), the thermodynamic driving force for 𝐴𝑄(𝐶𝑂 2 ) 2 2-adduct formation is very strong, and even at dilute CO2 concentrations (400 ppm), the capture capacity proceeds at a 2-1 ratio through nucleophilicity-swing mechanisms (see Figure ). Conversely, when 𝐾 𝐴𝑄_𝑎𝑑𝑑𝑢𝑐𝑡 is weak (e.g., 10 4 𝑀 -2 ), the dominant mechanism becomes pH-swing, and reducing pCO2 to values less than 0.05 bar shifts the equilibrium towards carbonate formation, diminishing the capture capacity to a 1 to 1 ratio.