Chemistry 9701/03 May June 2004 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of HCl concentration: Using a titration method with sodium carbonate to determine the concentration of hydrochloric acid, including calculations based on the mass of sodium carbonate and volume of acid required.
2. Filtration and solubility analysis: Separating and identifying ions in a mixture of soluble and insoluble solids, conducting tests with reagents like barium chloride, lead nitrate, and sodium hydroxide to identify anions and cations.
3. Ion identification: Identifying anions and cations in filtrates and residues through qualitative analysis, with observations on precipitate formation and solubility in excess reagents.
4. Test observations: Conducting specific reactions, such as with acidified potassium dichromate and iodine, to identify anions like sulfates, nitrites, and others based on color changes and precipitate formations.
5. Practical method planning: Designing experiments to identify solutions, including sodium hydroxide and sulfuric acid, and analyzing the chemical properties that distinguish them.