For which of the following acid-base titrations in aqueous solution will the pH at the equivalence point equal to 7.0?
a.titration of NH3 with HBr
b.titration of Ba(OH)2 with HNO2
c.titration of HF with NaOH
d.titration of KOH with HNO3 (Correct answer)
e.titration of CH3COOH with KOH