We are asked to identify the predominant species in H2CO3 at pH=7.5.
Recall that H2CO3 is a diprotic acid, an 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.
What will the predominant species in H 2CO3 at pH of 7.5?
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Our tutors have indicated that to solve this problem you will need to apply the Diprotic Acid concept. You can view video lessons to learn Diprotic Acid. Or if you need more Diprotic Acid practice, you can also practice Diprotic Acid practice problems.
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