for the diprotic weak acid h2a ka1 36 10 6 and ka2 51 10 9 what is the ph of a 00450 m solution

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For the diprotic weak acid H2A, Ka1 = 3.6 × 10^-6 and Ka2 = 5.1 × 10^-9. What is the pH of a 0.0450 M solution of H2A? What are the equilibrium concentrations of H2A and A2- in this solution? PH= [H2A]= M [A2-]= M