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Ascorbic acid has two dissociation constants, Ka1=7.9 x 10-5 and Ka2=1.6 x 10-12. What reactions do...

Ascorbic acid has two dissociation constants, Ka1=7.9 x 10-5 and Ka2=1.6 x 10-12. What reactions do these constants refer to? Why is one of sthem so much larger than the other? Which one should you use to calculate the theoretical pH of a 0.50 M solution of ascorbic acid, and why?

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