The concentration of carbonic acid, H2CO3, in a typical carbonated drink is approximately 7.0 x 10-2 M. Carbonic acid is a diprotic weak acid with the following pKa values for the 1st and 2nd ionizations:                H2CO3 + H2O  <===> H3O+ + HCO3-            pKa = 6.3                HCO3- + H2O  <===> H3O+ + CO32-              pKa = 10.3 From highest concentration

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Q: pH = U

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