Problem: What will the predominant species in H 2CO3 at pH of 7.5?

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We are asked to identify the predominant species in H2CO3 at pH=7.5


Recall that H2CO3 is a diprotic acidan acid which can donate up to two protons [H+] in solution. It has two Ka values for each proton dissociation as follows:


H2CO3(aq)+  H2O(aq)  ⇌  HCO3-(aq)  + H3O+(aq)       Ka1 = 4.5 x 10-7

HCO3-(aq)+  H2O(aq)  ⇌  CO32-(aq)  + H3O+(aq)          Ka2 = 4.7 x 10-11


Note: You can check on Ka values in books or the internet. 


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Problem Details

What will the predominant species in H 2CO3 at pH of 7.5?