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Acids and bases: CAIE A‑Level Chemistry questions

Every CAIE A-Level Chemistry exam question on 25.1 Acids and bases, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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312 questions

  1. Q1(b)

    June 2024 · Paper 4

    4 marks25.1 Acids and bases
    The whole paper ↗
    June 2024 Paper 4, question 1(b): Barium hydroxide, Ba(OH)2, is a strong base. A 250.0 cm3 solution of Ba(OH)2 with a pH of 12.2 is made by dissolving Ba(OH)2 in distilled water. Calculate the m

  2. Q1(c)(i)

    June 2024 · Paper 4

    1 mark25.1 Acids and bases
    The whole paper ↗
    June 2024 Paper 4, question 1(c)(i): Write the expression for the solubility product, Ksp, of Fe(OH)2. Ksp = [1]

  3. Q1(c)(ii)

    June 2024 · Paper 4

    2 marks25.1 Acids and bases
    The whole paper ↗
    June 2024 Paper 4, question 1(c)(ii): Calculate the value of Ksp of Fe(OH)2. Include its units. Ksp = units = [2] [Total: 12]

  4. Q3(f)

    June 2024 · Paper 4

    2 marks25.1 Acids and bases
    The whole paper ↗
    June 2024 Paper 4, question 3(f): Buffer solutions are used to regulate pH. Write two equations to describe how a solution containing HC2O4 – ions acts as a buffer solution when small amounts of

  5. Q2(c)

    Specimen · Paper 4

    1 mark25.1 Acids and bases
    The whole paper ↗
    Specimen Paper 4, question 2(c): Table 2.2 lists values of solubility products, Ksp, of some Group 2 carbonates. Table 2.2 solubility product in water at 298 K, Ksp / mol2 dm–6 MgCO3 1.0 × 10–5

  6. Q2(d)(i)

    Specimen · Paper 4

    1 mark25.1 Acids and bases
    The whole paper ↗
    Specimen Paper 4, question 2(d)(i): Write an equation to show the equilibrium for the solubility product of MgCO3. Include state symbols. ⇌ [1]

  7. Q2(d)(ii)

    Specimen · Paper 4

    2 marks25.1 Acids and bases
    The whole paper ↗
    Specimen Paper 4, question 2(d)(ii): With reference to your equation in (d)(i), suggest what is observed when a few cm3 of concentrated Na2CO3(aq) are added to a saturated solution of MgCO3. Explai

  8. Q2(e)

    Specimen · Paper 4

    2 marks25.1 Acids and bases
    The whole paper ↗
    Specimen Paper 4, question 2(e): Use the data in Table 2.2 to calculate the solubility of MgCO3 in water at 298 K, in g dm–3. Show your working. solubility of MgCO3 = g dm–3 [2]

  9. Q7(e)

    Specimen · Paper 4

    2 marks25.1 Acids and bases
    The whole paper ↗
    Specimen Paper 4, question 7(e): Solutions of iron(III) salts are acidic due to the equilibrium shown. [Fe(H2O)6]3+(aq) ⇌ [Fe(H2O)5(OH)]2+(aq) + H+(aq) Ka = 8.9 × 10–4 mol dm–3 Calculate the pH
All 9 questions on Acids and bases, as a list
  1. June 2024, Paper 4, Q1(b) (4 marks): Barium hydroxide, Ba(OH)2, is a strong base. A 250.0 cm3 solution of Ba(OH)2 with a pH of 12.2 is made by dissolving Ba(OH)2 in distilled water. Calculate the m
  2. June 2024, Paper 4, Q1(c)(i) (1 mark): Write the expression for the solubility product, Ksp, of Fe(OH)2. Ksp = [1]
  3. June 2024, Paper 4, Q1(c)(ii) (2 marks): Calculate the value of Ksp of Fe(OH)2. Include its units. Ksp = units = [2] [Total: 12]
  4. June 2024, Paper 4, Q3(f) (2 marks): Buffer solutions are used to regulate pH. Write two equations to describe how a solution containing HC2O4 – ions acts as a buffer solution when small amounts of
  5. Specimen, Paper 4, Q2(c) (1 mark): Table 2.2 lists values of solubility products, Ksp, of some Group 2 carbonates. Table 2.2 solubility product in water at 298 K, Ksp / mol2 dm–6 MgCO3 1.0 × 10–5
  6. Specimen, Paper 4, Q2(d)(i) (1 mark): Write an equation to show the equilibrium for the solubility product of MgCO3. Include state symbols. ⇌ [1]
  7. Specimen, Paper 4, Q2(d)(ii) (2 marks): With reference to your equation in (d)(i), suggest what is observed when a few cm3 of concentrated Na2CO3(aq) are added to a saturated solution of MgCO3. Explai
  8. Specimen, Paper 4, Q2(e) (2 marks): Use the data in Table 2.2 to calculate the solubility of MgCO3 in water at 298 K, in g dm–3. Show your working. solubility of MgCO3 = g dm–3 [2]
  9. Specimen, Paper 4, Q7(e) (2 marks): Solutions of iron(III) salts are acidic due to the equilibrium shown. [Fe(H2O)6]3+(aq) ⇌ [Fe(H2O)5(OH)]2+(aq) + H+(aq) Ka = 8.9 × 10–4 mol dm–3 Calculate the pH

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