6. A 0.3 mole HA aqueous solution (1L; if HA with $K_{\mathrm{a}} = 1 \times 10^{-6}$) was added 0.15 mole NaOH, what is the pH of this solution?
(A) 7
(B) 6
(C) 5
(D) 4
(E) 3

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統計： A(0), B(1), C(0), D(0), E(0) #3922350