Question

Which of the following titrations will have the highest pH at the equivalence point? A) A...

Which of the following titrations will have the highest pH at the equivalence point?

A) A titration of 0.25 M CH3N2H (Kb = 4.4x10-4) with 0.25 M HNO3

B) A titration of 0.25 M HClO (Ka = 3.5x10-8) with 0.25 M LiOH

C) A titration of 0.25 M HF (Ka = 7.4x10-4) with 0.25 M LiOH

D) A titration of 0.25 M LiOH with 0.25 M HNO3

E) A titration of 0.25 M C6H5NH2 (Kb = 4.6x10-10) with 0.25 M HNO3

F) A titration of 0.25 M HNO3 with 0.25 M LiOH

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Homework Answers

Answer #1

Which of the following titrations will have the highest pH at the equivalence point?

strong acid/base titrations = pH = 7

strong acid + weak base titration = acidic pH due to hydrolysis

strong base + weak acid titration = basic pH due to hydrolysis , this is, high pH

so:

choose a weak acid

B) A titration of 0.25 M HClO (Ka = 3.5x10-8) with 0.25 M LiOH

C) A titration of 0.25 M HF (Ka = 7.4x10-4) with 0.25 M LiOH

possible answers:

Kb = Kw/Ka

therefore, stronger acids, have lower KB, so

choose the weaekst acid

B) A titration of 0.25 M HClO (Ka = 3.5x10-8) with 0.25 M LiOH will be the best ansewr

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