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For the diprotic weak acid H2A, Ka1=2.1x10^-6 and Ka2=5.6x10^-9. What is the pH of a 0.0400...

For the diprotic weak acid H2A, Ka1=2.1x10^-6 and Ka2=5.6x10^-9. What is the pH of a 0.0400 M solution of H2A? What are the equilibrium concentrations of H2A and A^2- in this solution?

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