Problem: H2CO3 is a diprotic acid. The pKa for H2CO3 is 6.35, and the pKa for HCO3- is 10.33. At pH = 7.2 what is the "approximate" relative quantities of H2CO3, HCO- and CO32-?

FREE Expert Solution

We’re asked to determine the approximate relative quantities of each of the three species involved in the reaction.


The three species involved and their given pKa values are:

             H2CO3    HCO3-   CO32- 

pKa:                 6.35        10.33 


The dissociation will happen if the pH value overcomes the pKa value for the specific species.


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Problem Details

H2CO3 is a diprotic acid. The pKa for H2CO3 is 6.35, and the pKa for HCO3- is 10.33. At pH = 7.2 what is the "approximate" relative quantities of H2CO3, HCO- and CO32-?