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Citric acid is a triprotic acidwith Ka values of 7.4 x 10-4, 1.7 x 10-5, and...

Citric acid is a triprotic acidwith Ka values of 7.4 x 10-4, 1.7 x 10-5, and 4.0 x 10-7 for the first, second, and third ionization constants, respectively. A 0.500 M solution of a monoprotic acid with a Ka value of 7.4 x 10-4 has a pH = 1.72. What is the pH of a 0.500 M citric acid solution?

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