Q 2682578437.     30 ml of 0.06 M solution of the protonated form of an anion acid methonine `(H_2A^+)` is treated with 0.09 M NaOH. Calculate pH after addition of 20 ml of base. `pKa_1 = 2.28` and `pKa_2 = 9.2`.

A

5.5

B

5.74

C

9.5

D

none

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