🤓 Based on our data, we think this question is relevant for Professor Wallach's class at ODU.
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?