4) Consider the polyprotic acid H₂C2O4 (Ka1 = 5.9 x 102 and Ka2 = 6.4 x 10-5). a. Write out the reaction that produces Kal and write out the reaction that produces Ka2. b. Considering only Ka1, what is the pH of a 0.200 M H₂C₂O4 solution? c. Considering both Kai and Kaz, what is the pH of the 0.200 M H₂C₂O4 solution? How much did the [H3O+] and pH change by considering both? Does it appear to be a good assumption to only consider Kai when looking at polyprotic acids?

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4) Consider the polyprotic acid H₂C₂O4 (Ka1 = 5.9 x 10-2 and Ka2 = 6.4 x 10-5).
a. Write out the reaction that produces Ka1 and write out the reaction that produces Ka2.
b. Considering only Ka1, what is the pH of a 0.200 M H₂C₂O4 solution?
c. Considering both Kai and Ka2, what is the pH of the 0.200 M H₂C₂O4 solution? How much did the [H3O+] and pH
change by considering both? Does it appear to be a good assumption to only consider Ka1 when looking at
polyprotic acids?
Transcribed Image Text:4) Consider the polyprotic acid H₂C₂O4 (Ka1 = 5.9 x 10-2 and Ka2 = 6.4 x 10-5). a. Write out the reaction that produces Ka1 and write out the reaction that produces Ka2. b. Considering only Ka1, what is the pH of a 0.200 M H₂C₂O4 solution? c. Considering both Kai and Ka2, what is the pH of the 0.200 M H₂C₂O4 solution? How much did the [H3O+] and pH change by considering both? Does it appear to be a good assumption to only consider Ka1 when looking at polyprotic acids?
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