IBChemistry: SLDPExam Questions8. Acids & Bases8.1 Theories & Reactions of Acids & Bases

Syllabus Edition

First teaching 2014

Last exams 2024

|

Theories & Reactions of Acids & Bases (DP IB Chemistry: SL)

Exam Questions

2 hours43 questions

Select a question set to download for
8.1 Theories & Reactions of Acids & Bases

Select an answer set to view for
8.1 Theories & Reactions of Acids & Bases

Easy
Medium
Hard
11 mark

Using your knowledge of the Brønsted-Lowry theory, which of the following correctly describes ammonia?

  • neutral

  • acid

  • base

  • amphoteric

Choose your answer

Did this page help you?

21 mark

In the Brønsted–Lowry theory of acids and bases, the difference between a conjugate acid and its conjugate base is the presence of which of the following?

  • a positive charge

  • a pair of electrons

  • a proton

  • a hydrogen atom

Choose your answer

Did this page help you?

31 mark

Which of the following ions or compounds is amphiprotic?

  • P4O10

  • PO43−

  • HCO3−

  • Al2O3

Choose your answer

Did this page help you?

41 mark

In the following reaction, identify which two species are acting as Brønsted–Lowry acids

H3PO4 (aq) + OH− (aq)  ⇋ H2PO4− (aq) + H2O (l)

  • H2PO4− (aq) and OH− (aq)

  • H3PO4 (aq) and H2PO4− (aq)

  • H2PO4− (aq) and H2O (l)

  • H3PO4 (aq) and H2O (l)

Choose your answer

Did this page help you?

51 mark

Potassium hydrogen carbonate reacts vigorously with dilute sulfuric acid. Identify the correct formulas of the substances produced in the reaction

  • K2SO4 + H2O + CO2

  • K2SO4 + CO2

  • KSO4 + H2O + CO2

  • KSO4 + H2CO3

Choose your answer

Did this page help you?

61 mark

Copper(II) sulfate can be made by the reaction between dilute sulfuric acid and which of the following?

  1. Cu
  2. CuO
  3. CuCO3

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

Choose your answer

Did this page help you?

71 mark

Which statement is correct for the following equation?

HSO4- (aq) + OH- (aq) ⇌ SO4- (aq) + H2O (l)

  • OH- and H2O are an acid and conjugate base pair

  • SO4- is acting as Brønsted–Lowry acid

  • HSO4- and SO4- are a base and conjugate acid pair

  • OH- and H2O are a base and conjugate acid pair

Choose your answer

Did this page help you?

81 mark

Which row shows the correct acid and base needed to make the salt specified? 

 

Acid

Base

Salt

A

NaHCO3

SO2

Na2SO4

B

HNO3

SO3

(NH4)2SO4

C

H2SO4

ZnO

ZnSO3

D

H2SO4

NH4OH

(NH4)2SO4

    Choose your answer

    Did this page help you?

    91 mark

    Which is a conjugate acid-base pair?

    HCO3- (aq) + H2O (l)  ⇌ CO32- (aq) + H3O+ (aq)

    • HCO3- / H3O+

    • HCO3- / CO32- 

    • H2O / CO32- 

    • HCO3- / H2O

    Choose your answer

    Did this page help you?

    101 mark

    Which coefficients balance the following acid-base equation?

    Al(OH)3 (s) + HNO3 (aq)  ⇌ Al(NO3)3 (aq) + H2O (l)

    A

    3

    1

    3

    1

    B

    2

    2

    1

    3

    C

    1

    3

    1

    3

    D

    1

    2

    1

    2

      Choose your answer

      Did this page help you?

      11 mark

      The typical reactions of dilute acids include them being able to react with

      1. NaHCO3
      2. Mg
      3. Cu

      • I and II only

      • I and III only

      • II and III only

      • I, II and III

      Choose your answer

      Did this page help you?

      21 mark

      The following reaction occurs between concentrated sulfuric and nitric acids.

      H2SO4 + HNO3 ⇋  H2NO3+ + HSO4-

      Identify the two species which are acting as Brønsted–Lowry bases.

      • H2NO3+ and HSO4-

      • HNO3 and H2NO3+

      • H2SO4 and HSO4- 

      • HNO3 and HSO4-

      Choose your answer

      Did this page help you?

      31 mark

      What role does each species play in the equilibrium below according to Brønsted-Lowry theory?

      CH3COOH + HCl  ⇌ CH3COOH2+ + Cl-

       

      CH3COOH

      HCl

      CH3COOH2+

      Cl-

      A

      acid

      base

      base

      acid

      B

      acid

      base

      acid

      base

      C

      base

      acid

      base

      acid

      D

      base

      acid

      acid

      base

        Choose your answer

        Did this page help you?

        41 mark

        Perbromic acid, HBrO4 , is an example of a strong acid when dissolved in water. What is true about perbromic acid?

        • HBrO4 is largely found as molecules in the solution

        • HBrO4 solution reacts only with strong bases

        • HBrO4 is fully dissociated in solution

        • HBrO4 has a pH greater than 7

        Choose your answer

        Did this page help you?

        51 mark

        Potassium hydrogenphosphate has the formula K2HPO4 . What is the conjugate base of this compound?

        • H2PO4-

        • KHPO42-

        • PO43-

        • KH2PO4

        Choose your answer

        Did this page help you?

        61 mark

        For the equilibrium equation shown, which species are Brønsted-Lowry acids?

        H3NSO3 (aq) + 2NH3 (aq) ⇌ HNSO32- (aq) + 2NH4+ (aq)

        • NH4+ and NH3

        • NH4+ and HNSO32-

        • H3NSO3 and HNSO32-

        • H3NSO3 and NH4+

        Choose your answer

        Did this page help you?

        71 mark

        Which would be formed when calcium oxide reacts with hydrochloric acid ?

        • Calcium chloride and carbon dioxide

        • Calcium chloride, hydrogen gas and water

        • Calcium, hydrogen gas and water

        • Calcium chloride and water

        Choose your answer

        Did this page help you?

        81 mark

         What is the sum of the coefficients when the following acid-base equation is balanced?

        _HNO3 (aq) + _Mg(HCO3)2 (s) →  _Mg(NO3)2 (aq) + _H2O (l) + _CO2  (g)

        • 5

        • 6

        • 7

        • 8

        Choose your answer

        Did this page help you?

        91 mark

        Which oxides react with calcium oxide?

        1. SO2
        2. NO2
        3. K2O

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

        Choose your answer

        Did this page help you?

        101 mark

        Which row correctly describes the reaction specified?

         

        Reaction

        Energy change

        A

        metal displacement

        endothermic

        B

        neutralisation

        exothermic

        C

        combustion

        endothermic

        D

        melting ice

        exothermic

          Choose your answer

          Did this page help you?

          11 mark

          Some species may be classified as amphiprotic, some as amphoteric and some as both. Which of the following applies to HPO42−?

          • Amphiprotic but not amphoteric

          • Amphoteric but not amphiprotic

          • Amphiprotic and amphoteric

          • Neither amphiprotic nor amphoteric

          Choose your answer

          Did this page help you?

          21 mark

          The aromatic compound phenol, C6H5OH, behaves as a weak acid, due the presence of a hydroxyl group on the benzene ring. What is the correct formula of the conjugate base formed when phenol dissociates?

          • C6H4--OH 

          • C6H5-OH2+

          • C6H5-O-

          • C6H6+-OH 

          Choose your answer

          Did this page help you?

          31 mark

          What is the sum of the coefficients when the following acid-base equation is balanced?

          _Al2(CO3)3 (s) + _HNO3 (aq)  ⇌ _Al(NO3)3 (aq) + _H2O (l) +  _CO2 (g)

          • 6

          • 7

          • 14

          • 15

          Choose your answer

          Did this page help you?

          41 mark

          Which of the following substances can be used to prepare magnesium sulfate by a neutralization reaction with dilute sulfuric acid?

          1. Mg
          2. MgO
          3. MgCO3

          • I and II only

          • I and III only

          • II and III only

          • I, II and III

          Choose your answer

          Did this page help you?

          51 mark

          Phosphoric acid is a polyprotic acid and can produce amphiprotic species when it dissociates. Which of the following species is amphiprotic?

          1. HPO42−
          2. H2PO4−
          3. PO43−

          • I and II only

          • I and III only

          • II and III only

          • I, II and III

          Choose your answer

          Did this page help you?

          61 mark

          Use the following reactions to answer the question below:

          H2O (l) + F- (aq) ⇌ HF (aq) + OH- (aq)

          H2O (l) + HNO3 (aq) → H3O+ (aq) + NO3- (aq)

          H2O (l) + CO2 (g) ⇌ H2CO3 (aq)

          H2O (aq) +  NH3 (aq) ⇌ NH4OH (aq) 

          Which of the following statements is true?

          • HNO3 and H2O both act as acids once

          • H2O is shown acting as a Bronsted-Lowry acid only

          • H2O reacts as an acid twice

          • H2O is shown as a diprotic acid

          Choose your answer

          Did this page help you?

          71 mark

          Which species are Bronsted-Lowry acids in the reaction shown?

          H2PO4− (aq) + CN- (aq) ⇌  HCN (aq)  + HPO42− (aq)

          • HCN and H2PO4−

          • HCN and CN-

          • H2PO4− and HPO42−

          • HCN and HPO42−

          Choose your answer

          Did this page help you?

          81 mark

          Which of the following solutions will react with a strip magnesium ribbon?

          • Sodium hydrogencarbonate

          • Sodium hydrogensulfate

          • Ammonia

          • Limewater

          Choose your answer

          Did this page help you?

          91 mark

          Which substance reacts with ammonia but is not a Brønsted–Lowry acid?

          • HCl

          • CH3COOH

          • BF3

          • CF3COOH

          Choose your answer

          Did this page help you?

          101 mark

          Which row shows the correct systematic name of the acid?

           

          Formula

          Name

          A

          HClO3

          chloric(V) acid

          B

          H2SO3

          hydrogensulfate(VI) acid

          C

          H3PO3

          phosphoric(V) acid

          D

          HNO2

          nitrous acid

            Choose your answer

            Did this page help you?