What is the pH of a 0.05 M HPO42- solution? (Ka1 (H3PO4) = 7.11 x 10-3,...

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Question

What is the pH of a 0.05 M HPO₄^2- solution?

(K_a1 (H₃PO₄) = 7.11 x 10^-3, (K_a2 (H₃PO₄) = 6.32 x 10^-8, (K_a3 (H₃PO₄) = 4.5 x 10^-13)

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