Chemistry 9701/34 Oct Nov 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Quantitative titration analysis using bromophenol blue and phenolphthalein indicators to determine the percentage composition of Na₂CO₃ in a NaOH-Na₂CO₃ mixture, with stoichiometric calculations.
2. Mass loss method to determine CO₂ evolved during the reaction of Na₂CO₃ with HCl, used for percentage purity assessment of a Na₂CO₃-NaCl mixture, highlighting potential experimental errors and improvements.
3. Identification of cations and anions in solid samples using qualitative tests with nitric acid, NaOH, ammonia, and potassium iodide, emphasizing solubility and precipitate formation criteria.
4. Qualitative analysis of unknown compound FB 7 through reactions with magnesium ribbon, sulfuric acid, potassium manganate(VII), and heat-induced decomposition, leading to deductions about its composition.
5. Application of practical analytical techniques for identifying gaseous products, solubility behaviors, and ionic reactions, supported by qualitative analysis notes detailing cation-anion specific reactions.