Chemistry 9701/36 Oct Nov 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of potassium manganate(VII) concentration through redox titration with sodium thiosulfate, including iodine production and starch indicator endpoint.
2. Hydrated salt analysis to calculate the relative atomic mass of a metal, involving mass loss through water of crystallization and mole ratio determinations.
3. Qualitative analysis of anions and cations using precipitation reactions, solubility testing, and gas evolution identification, guided by standard qualitative notes.
4. Error analysis in titrimetric experiments, focusing on burette precision and percentage error calculations.
5. Identification and reaction testing of cations such as Fe²⁺, Zn²⁺, and Cu²⁺, and anions like sulfate and iodide using diagnostic reagents and reaction observations.
6. Procedural refinements for improved accuracy in heating and cooling steps of hydrated salt analysis to prevent moisture interference.