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Arsenic acid is a triprotic acid with the following pKa values: pKa 1 = 2.240; pKa2...

Arsenic acid is a triprotic acid with the following pKa values: pKa 1 = 2.240; pKa2 = 6.960; pKa3 = 11.500. You wish to prepare 1.000 L of a 0.0400 M aresenate buffer at pH 10.430. To do this, you choose to mix the two salt forms involved in the second ionization, Na3AsO4 and Na2HAsO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture?

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