plumiReacting masses and volumes (of solutions and gases): CAIE A‑Level Chemistry questions
Every CAIE A-Level Chemistry exam question on 2.4 Reacting masses and volumes (of solutions and gases), June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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Calculations
Q1(a)(i)
The whole paper ↗![June 2024 Paper 5, question 1(a)(i): Determine the mass, in g, of Na2S2O3•5H2O(s) required to prepare 500.0 cm3 of 0.00200 mol dm–3 Na2S2O3(aq). mass of Na2S2O3•5H2O(s) = g [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-ai-qp.webp)
Q1(a)(ii)
The whole paper ↗
Q1(b)(i)
The whole paper ↗![June 2024 Paper 5, question 1(b)(i): Calculate the percentage error in the measurement of 5.0 cm3 of alkaline aqueous potassium iodide by the syringe. Show your working. percentage error = [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-bi-qp.webp)
Q1(b)(ii)
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Q1(c)(i)
The whole paper ↗![June 2024 Paper 5, question 1(c)(i): Preparing the clean burette before taking any readings. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-ci-qp.webp)
Q1(c)(ii)
The whole paper ↗![June 2024 Paper 5, question 1(c)(ii): Carrying out the one accurate titration in step 6. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-cii-qp.webp)
Q1(d)
The whole paper ↗![June 2024 Paper 5, question 1(d): Suggest why the reaction mixture is mixed well in steps 2–4. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-d-qp.webp)
Q1(e)
The whole paper ↗![June 2024 Paper 5, question 1(e): Draw a table for recording the titration results for the five samples in syringes A–E. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-e-qp.webp)
Q1(f)
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Q1(g)(i)
The whole paper ↗![June 2024 Paper 5, question 1(g)(i): Suggest why the student did not get a value of 0 mol dm–3. Assume the procedure was carried out correctly. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-gi-qp.webp)
Q1(g)(ii)
The whole paper ↗![June 2024 Paper 5, question 1(g)(ii): Suggest how the value of 2.26 × 10–5 mol dm–3 could be used to improve the answer in (f). [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970151-jun24-01-gii-qp.webp)
Q6(c)(iii)
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Q1(a)(i)
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Q1(a)(ii)
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Q1(a)(iii)
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Q1(a)(iv)
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Q1(a)(v)
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All 26 questions on Reacting masses and volumes (of solutions and gases), as a list
- June 2024, Paper 5, Q1(a)(i) (1 mark): Determine the mass, in g, of Na2S2O3•5H2O(s) required to prepare 500.0 cm3 of 0.00200 mol dm–3 Na2S2O3(aq). mass of Na2S2O3•5H2O(s) = g [1]
- June 2024, Paper 5, Q1(a)(ii) (1 mark): Identify the piece of apparatus that should be used to prepare 500.0 cm3 of 0.00200 mol dm–3 Na2S2O3(aq) after the required mass of Na2S2O3•5H2O(s) has been wei
- June 2024, Paper 5, Q1(b)(i) (1 mark): Calculate the percentage error in the measurement of 5.0 cm3 of alkaline aqueous potassium iodide by the syringe. Show your working. percentage error = [1]
- June 2024, Paper 5, Q1(b)(ii) (1 mark): Place one tick (✓) in each row in Table 1.1 to show the effect, if any, of using a larger volume of alkaline aqueous potassium iodide. Table 1.1 greater effect
- June 2024, Paper 5, Q1(c)(i) (2 marks): Preparing the clean burette before taking any readings. [2]
- June 2024, Paper 5, Q1(c)(ii) (2 marks): Carrying out the one accurate titration in step 6. [2]
- June 2024, Paper 5, Q1(d) (1 mark): Suggest why the reaction mixture is mixed well in steps 2–4. [1]
- June 2024, Paper 5, Q1(e) (2 marks): Draw a table for recording the titration results for the five samples in syringes A–E. [2]
- June 2024, Paper 5, Q1(f) (2 marks): The overall reaction taking place in the experiment is shown. O2(aq) + 4S2O3 2–(aq) + 4H+(aq) 2S4O6 2–(aq) + 2H2O(l) A student carries out the experiment and de
- June 2024, Paper 5, Q1(g)(i) (1 mark): Suggest why the student did not get a value of 0 mol dm–3. Assume the procedure was carried out correctly. [1]
- June 2024, Paper 5, Q1(g)(ii) (1 mark): Suggest how the value of 2.26 × 10–5 mol dm–3 could be used to improve the answer in (f). [1]
- June 2024, Paper 1, Q1 (1 mark): Sample X is added to water and made up to a total volume of 200 cm3. This gives a solution of 0.100 mol dm–3 HCl. What is X? A 10 cm3 of 1.00 mol dm–3 HCl B 30
- June 2024, Paper 1, Q2 (1 mark): A mixture of 10 cm3 of methane and 10 cm3 of ethane was sparked with an excess of oxygen. After cooling, the residual gas was passed through aqueous potassium h
- June 2024, Paper 1, Q20 (1 mark): What is the total volume of gas produced, measured at room conditions, when 0.010 mol of anhydrous magnesium nitrate is completely decomposed by heating? A 240
- June 2024, Paper 2, Q6(c)(iii) (2 marks): Under certain conditions, 0.0020 mol of Q reacts with an excess of sodium to produce a total of 44.8 cm3 of gas at s.t.p. Calculate the number of hydroxyl group
- Specimen, Paper 5, Q1(a)(i) (1 mark): A student suggests that finding the volume of dilute hydrochloric acid required to react with a known mass of verdigris would be a suitable method to determine
- Specimen, Paper 5, Q1(a)(ii) (3 marks): The 10.0 mol dm–3 HCl is too concentrated for use in the experiment. Instead, a more dilute solution should be prepared. Describe how you would accurately prepa
- Specimen, Paper 5, Q1(a)(iii) (2 marks): The percentage of copper(II) carbonate in a sample of verdigris can be determined by measuring the volume of gas produced when excess hydrochloric acid is added
- Specimen, Paper 5, Q1(a)(iv) (2 marks): Sketch a graph on the axes to show how the volume of gas produced would change during your experiment. The independent variable should be on the x-axis. • Label
- Specimen, Paper 5, Q1(a)(v) (2 marks): A student thinks that their 0.494 g sample of verdigris only contains CuCO3. Calculate the minimum volume, in cm3, of 0.500 mol dm–3 HCl that is needed to compl
- Specimen, Paper 5, Q1(b)(i) (1 mark): Complete Table 1.1. [1]
- Specimen, Paper 5, Q1(b)(ii) (1 mark): Calculate the percentage uncertainty in titre 1. [1]
- Specimen, Paper 5, Q1(b)(iii) (3 marks): The student concludes that 24.15 cm3 of 0.400 mol dm–3 sulfuric acid completely reacts with 1.50 g of azurite. Calculate the percentage by mass of Cu3(CO3)2(OH)
- Specimen, Paper 5, Q1(b)(iv) (4 marks): Identify two possible problems with the student’s titration experiment and suggest improvements to it. problem 1 improvement 1 problem 2 improvement 2 [4] [Tota
- Specimen, Paper 1, Q33 (1 mark): A sample of 2.30 g of ethanol is mixed with an excess of aqueous acidified potassium dichromate(VI). The reaction mixture is then boiled under reflux for one ho
- Specimen, Paper 2, Q2(c)(ii) (1 mark): Calculate the amount, in moles, of C60 that reacts. amount of C60 = mol [1]
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