Reacting masses and volumes (of solutions and gases): past paper questions
Real questions on reacting masses and volumes (of solutions and gases)
The newest 20 of 335 written questions. Open one to see it on the real paper.
- 9701/41 · May/June 2026 · Q5e(iv)[3]
Calculate the mass, in g, of the piece of copper added to HNO 3 (aq). mass of copper = g
See it on the paper → - 9701/52 · February/March 2026 · Q1a[1]
A student weighs a sample bottle containing X and transfers X into a small beaker. The student reweighs the sample bottle. The measurements are shown in Table 1.1. Table 1.1 mass of sample bottle and X / g 7.235 mass of sample bottle after transfer / g 6.035 mass of X transferred to small beaker / g Complete Table 1.1...
See it on the paper → - 9701/52 · February/March 2026 · Q1b(i)[1]
Calculate the percentage error in the measurement of the mass of the sample bottle and X shown in Table 1.1. Show your working. percentage error = %
See it on the paper → - 9701/52 · February/March 2026 · Q1b(ii)[1]
Without changing any apparatus, suggest how the percentage error calculated in 1(b)(i) can be reduced.
See it on the paper → - 9701/52 · February/March 2026 · Q1c[3]
Describe the steps the student should take to prepare 250.0 cm 3 of an aqueous solution of X, starting from the mass of X calculated in 1(a) supplied in the small beaker. Give the name and capacity of any apparatus used. Write your answer using a series of numbered steps.
See it on the paper → - 9701/52 · February/March 2026 · Q1d(i)[1]
Other than wearing safety goggles, give one safety precaution that the student must take when handling KB(C 6 H 5 ) 4 (s).
See it on the paper → - 9701/52 · February/March 2026 · Q1d(ii)[1]
Identify a suitable piece of apparatus to transfer 25.0 cm 3 of solution X in step 1.
See it on the paper → - 9701/52 · February/March 2026 · Q1d(iii)[1]
Suggest why the volume of NaB(C 6 H 5 ) 4 (aq) does not need to be measured accurately in step 2.
See it on the paper → - 9701/52 · February/March 2026 · Q1d(iv)[1]
Suggest one reason why conical flask D is kept cool in an ice bath in step 2.
See it on the paper → - 9701/52 · February/March 2026 · Q1d(v)[1]
Suggest one reason why the Gooch crucible is placed in an oven at 120 °C in step 3.
See it on the paper → - 9701/52 · February/March 2026 · Q1f[1]
Complete Table 1.2 to show the effect, if any, on the calculated masses of KCl and NaCl if the residue of KB(C 6 H 5 ) 4 was not washed in step 6 of the first experiment. Use the words higher, lower or no effect in your answer. Table 1.2 effect on calculated mass of KCl in 1(d)(vii) effect on calculated mass of NaCl in...
See it on the paper → - 9701/52 · February/March 2026 · Q1g[1]
Another student repeated the first experiment but heated the Gooch crucible to 320 °C in step 7. Suggest why the mass of precipitate collected by this student was significantly lower than the mass of precipitate collected by the first student. Turn over
See it on the paper → - 9701/52 · February/March 2026 · Q2a(i)[1]
Complete Table 2.1 to show the volume of distilled water added to make each prepared solution of known [K + (aq)].
See it on the paper → - 9701/22 · October/November 2025 · Q2f(i)[2]
Construct an equation to show the reaction of aqueous MgCl 2 with aqueous Na 2 CO 3 . Use state symbols in your equation.
See it on the paper → - 9701/22 · October/November 2025 · Q2f(ii)[1]
Identify the products of the thermal decomposition of the white precipitate.
See it on the paper → - 9701/23 · October/November 2025 · Q2c(i)[1]
Write an equation for the reaction of Na 2 O with dilute hydrochloric acid.
See it on the paper → - 9701/41 · October/November 2025 · Q1a(i)[1]
Write an equation for the decomposition of strontium hydrogencarbonate, Sr(HCO 3 ) 2 .
See it on the paper → - 9701/41 · October/November 2025 · Q5f(i)[3]
Calculate the percentage by mass of vanadium in the 0.250 g of impure sample. Assume the impurities do not contain any vanadium ions. Show your working. percentage of vanadium = (i)
See it on the paper → - 9701/42 · October/November 2025 · Q1c(i)[1]
Identify the products formed when MgO reacts with dilute sulfuric acid.
See it on the paper → - 9701/43 · October/November 2025 · Q5f(i)[3]
Calculate the percentage by mass of vanadium in the 0.250 g of impure sample. Assume the impurities do not contain any vanadium ions. Show your working. percentage of vanadium = (i)
See it on the paper →
What examiners said
Comprehensive responses • Nearly all candidates gave the correct answer to three decimal places to reflect the accuracy of the balance. Limited responses • A few candidates did not give their answer to three decimal places.
— Examiner report, February/March 2026, 9701/52 Q1(a) (Cambridge)
Comprehensive responses • Many candidates showed full working and derived the correct answer. Limited responses • Some candidates showed incomplete working or calculated the percentage error in the mass of X.
— Examiner report, February/March 2026, 9701/52 Q1(b)(i) (Cambridge)
Comprehensive responses • Most candidates correctly stated that the mass of X should be increased. Limited responses • Some candidates suggested changing the apparatus.
— Examiner report, February/March 2026, 9701/52 Q1(b)(ii) (Cambridge)
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