Titration problems, finding the pH. The correct answers are both C, but I dont u

Question

Titration problems, finding the pH.

The correct answers are both C, but I dont understand why.

18. A 50 mL sample of chlorous acid HCIO2 is titrated to the equivalence point by adding 45 mL of 0.102 M NaOH at 25 degree C. What is the pH of the solution at the equivalence point? For HClO2, Ka = 1.1 X 10^-2. A. 2.0 B. 5.8 c. 7.3 D. 8.2 E. 12.0 19. A 25 mL sample of 0.100 M methylamine is titrated using 0.112 M HCI (aq) at 25 degree C. What is the pH after 15 mL of acid has been added? Kb for CH3NH2 = 4.4 x 10^-4 A. 3.1 B. 3.4 C. 10.3 D. 10.6 E. 11.0

Explanation / Answer

I think 18 A 19C

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