15. After adding 10 mL of 0.15 M KOH into 30 mL of 0.08 M HNO2 (Ka = 4.5 x 10-4), which of the following statements is NOT correct?
(A) The neutralization reaction between KOH and HNO2 almost reaches completion.
(B) The solution has a higher buffer capacity against strong bases than against strong acids.
(C) The solution pH is still within the most effective buffer range.
(D) The solution pH is approximately 3.57.
(E) Compared to the original solution, the percent ionization of HNO2 is decreased. 

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