AP®ChemistryCollege BoardExam QuestionsUnit 8: Acids & BasesAcids & Bases

Acids & Bases (College Board AP® Chemistry)

Exam Questions

33 mins9 questions

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Acids & Bases

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Acids & Bases

11 mark

Which of the following is the acid dissociation, Ka, constant for ethanoic acid? 

  • CH3COOH 

  • fraction numerator left square bracket CH subscript 3 COO to the power of minus right square bracket left square bracket straight H to the power of plus right square bracket over denominator left square bracket CH subscript 3 COOH right square bracket end fraction

  • fraction numerator left square bracket CH subscript 3 COOH right square bracket over denominator left square bracket CH subscript 3 COO to the power of minus right square bracket left square bracket straight H to the power of plus right square bracket end fraction

  • left square bracket CH subscript 3 COO to the power of minus right square bracket left square bracket straight H to the power of plus right square bracket

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21 mark

25.00 mL of 0.25 M nitric acid is added to 12.50 mL of 0.10 M sodium hydroxide.

What is the pH of the resulting mixture?

  • 2.30

  • 0.60 

  • 0.88

  • 13.00

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31 mark

HF (aq) ⇌ H+ (aq) + F (aq) Ka = 6.3 x 10-4

On the basis of the information above, what is the approximate percent ionization of HF in a 0.25 M HF (aq) solution?

  • 0.05%

  • 5.2%

  • 0.063%

  • 6.3 x 10-4%

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41 mark

What is the correct expression for the base dissociation constant, Kb, for propylamine?

  • Kb = begin mathsize 14px style fraction numerator left square bracket C H subscript 3 C H subscript 2 C H subscript 2 N H subscript 3 to the power of plus right square bracket open square brackets O H to the power of minus sign close square brackets over denominator open square brackets C H subscript 3 C H subscript 2 C H subscript 2 N H subscript 2 close square brackets end fraction end style

  • Kb = begin mathsize 14px style fraction numerator left square bracket C H subscript 3 C H subscript 2 C H subscript 2 N H subscript 3 to the power of plus right square bracket open square brackets H subscript 2 O close square brackets over denominator open square brackets C H subscript 3 C H subscript 2 C H subscript 2 N H subscript 2 close square brackets end fraction end style

  • Kb = begin mathsize 14px style fraction numerator left square bracket C H subscript 3 C H subscript 2 C H subscript 2 N H subscript 3 to the power of plus right square bracket open square brackets O H to the power of minus sign close square brackets over denominator open square brackets C H subscript 3 C H subscript 2 C H subscript 2 N H subscript 2 close square brackets open square brackets H subscript 2 O close square brackets end fraction end style

  • Kb = begin mathsize 14px style left square bracket C H subscript 3 C H subscript 2 C H subscript 2 N H subscript 3 to the power of plus right square bracket open square brackets O H to the power of minus sign close square brackets end style

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51 mark

What is the approximate pH of 0.50 M benzoic acid, C6H5COOH (aq)?

Ka of C6H5COOH = 6.3 x 10-5

  • 4.50

  • 4.20

  • 0.30

  • 2.25

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