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3.  For which of the following titrations will the pH at the equivalence point NOT be neutral?  Explain why.  (Hint:  Determine the relative strengths of the acids and bases in the titration.) 
 a) HNO2 by NaOH

b) KOH by HClO4

c) HCOOH by KOH

d) CH3NH2 by HNO3

Roger the Mole · Answer

a) HNO2 by NaOH will be basic, because HNO2 is a weak acid and NaOH is a strong base.

c) HCOOH by KOH will be basic, because HCOOH is a weak acid and KOH is a strong base.

d) CH3NH2 by HNO3 will be acidic because CH3NH2 is a weak base and HNO3 is a strong acid.

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