Chemistry 9701/31 Oct Nov 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of iron(II) salt's molar mass using KMnO₄ titration and stoichiometry.
2. Quantitative calculations for titration involving Fe²⁺ and MnO₄⁻, including error analysis for pipette and mass measurements.
3. Experimental determination of the hydration level in barium chloride, BaCl₂·xH₂O, by thermal decomposition.
4. Method refinements for complete dehydration of hydrated salts and consistency analysis across multiple trials.
5. Qualitative tests for ion identification using reagents such as NaOH, AgNO₃, and NH₃ with observations of precipitate solubility.
6. Comprehensive application of qualitative analysis notes for gas evolution tests, anion reactions, and confirmation of cations like Fe²⁺ and Ba²⁺.