What is [H3O+] and the pH of a solution of H2CO3 with [H2CO3]Total = 4.5 x 10-4 M? (Use the pKa value for H2CO3 given in Problem 3.) Hint: This is not a buffer.
I only need help with problem 4 please.
3. 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 to lowest concentration, what are the molecular and ionic species present in an aqueous solution of 7.0 x 10-2 M H2CO3 (note: you do not have to calculate the concentrations, just rank them in order of highest to lowest).
4. What is [H3O+] and the pH of a solution of H2CO3 with [H2CO3]Total = 4.5 x 10-4 M? (Use the pKa value for H2CO3 given in Problem 3.) Hint: This is not a buffer.
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