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Consider the titration of 100.0 mL of 0.42 M H3A by 0.42 M KOH for the...

Consider the titration of 100.0 mL of 0.42 M H3A by 0.42 M KOH for the next three questions. The triprotic acid has Ka1 = 1.0 x 10-4, Ka2 = 1.0 x 10-7, and an unknown value for Ka3. All answers to 3 significant digits.

1) Calculate the pH after 100.0 mL of KOH has been added.

pH =

2) Calculate the pH after 150.0 mL of KOH has been added.

pH =

3) The pH of the solution after 200.0 mL of KOH has been added is 9.00. Determine the value of Ka3 for this triprotic acid. Use scientific notation to enter this answer, e.g., 1.0 x 10-3 = 1.0E-3.

Ka3 =

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Expert Solution

queen_honey_blossom answered 4 months ago
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