Chemistry 9701/32 May June 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Titrimetric analysis to determine the percentage purity of sodium carbonate in a contaminated sample, including dilution, titration, and stoichiometric calculations.
2. Heat energy measurements in a reaction between magnesium and hydrochloric acid, with calculations of molar enthalpy and magnesium content in a mixed sample.
3. Identification of cations in a solution using qualitative tests with sodium hydroxide, ammonia, and solubility assessments, including challenges in confirming nitrate ion presence.
4. Halogen identification in a halogenoalkane using ethanol and silver nitrate, with reaction type classification for halide precipitation.
5. Testing interactions between FB 8 and FB 9, identifying cations and anions based on reaction outcomes, with precipitate formation analyzed using barium chloride.
6. Guidelines for accurate reagent handling, experimental controls, and qualitative observations to improve precision in practical analytical chemistry.