Bicarbonator
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formulaphasenHchargeadd H2OΔGº
ΔGº with water
ΔG'ºexp(-ΔG'º/RT)proportion
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CO2 + H2Oaq001-386.0-623.2-554.71.54E+970.705
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H2CO3aq200-606.3-606.3-537.81.68E+947.68E-04
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HCO3aq1-10-586.8-586.8-552.66.44E+960.294
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CO3aq0-20-527.8-527.8-527.82.96E+920.000
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Constants:Permeability
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ΔGº of water (kJ/mol)-237.2FractionPermeability (cm/s)Note
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pH6
change the value of pH to see the effect on the proportions
H2CO32.60E-033.00E-03
like formate, xiang 1994
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R (J/mol/K)8.314HCO3-9.97E-012.00E-07gutknecht, 1977
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T (K)298.15CO3--4.59E-052.00E-07like HCO3-
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RT (kJ/mol)2.48weighted avg8.01E-06
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* all ΔGº values are from Alberty and given in kJ/mol
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Note add by RM: Based on Henry's law the concentration of CO2(aq) is roughly 10uM under standard atmosphere irrespective of the pH
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Ratio of bicarbonate to CO2:
0.418
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Ratio of HCO3- to H2CO3
3.83E+02
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