6. A 10.0 mL sample of 0.20 M HNO_{2(aq )} solution is titrated with 0.10 M NaOH_(aq)• (Ka of HNO₂ is 4.3x10 ^-4 ).Initial mol of NO₂^- is 0.0667 M. Calculate_ the pH at the equivalence point. (Hint: log(I.Z47x 10^-6＝－5．9I
(A)S.1,
(B)6.1,
(C)7.1,
(D)S.1,
(E) none of above

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