AS & A Level Chemistry (9701) — May–June 2025, Paper 31
3 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 10 marks · Practical skills: measurement, recording data
You will determine the percentage purity of a sample of impure calcium carbonate, FA 1, by reacting it with excess hydrochloric acid and measuring the volume of carbon dioxide…
Answer this question and get it marked →Question 2 · 18 marks · Practical skills: titration technique, recording data
You will determine the percentage purity of another sample of calcium carbonate, CaCO3, by titration. FA 3 has been prepared by reacting 19.0 g of FA 1 with 250 cm3 of 2.00 mol…
Answer this question and get it marked →Question 3 · 12 marks · Practical skills: qualitative analysis, identification of ions
FA 7 is a solution containing two cations and one anion. All of the ions are listed in the Qualitative analysis notes. (i) Carry out the following tests and record your…
Answer this question and get it marked →