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The next three (3) problems deal with the titration of 301 mL of 0.501 M carbonic...

The next three (3) problems deal with the titration of 301 mL of 0.501 M carbonic acid (H2CO3) (Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10-11) with 1.3 M KOH.

How many mL of the 1.3 M KOH are needed to raise the pH of the carbonic acid solution to a pH of 6.635?

Could someone show their work for this. I've been trying to solve this for the last hour, but I can't seem to get the right answer.

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