Chemistry 9701/05 Oct Nov 2008 | Cambridge AS Level Past Papers With Mark Scheme

1. Solubility of Cerium(IV) Sulphate: The relationship between cerium(IV) sulphate solubility and the concentration of sulfuric acid, with predictions and explanations of the behavior of ions in solution.
2. Experimental Design for Solubility: Steps for planning an experiment to investigate the solubility of cerium(IV) sulphate in water and sulfuric acid, including the independent and dependent variables, controlled variables, and experimental procedure.
3. Solubility in Water: Detailed steps to prepare a saturated solution of cerium(IV) sulphate in distilled water, including measurements, separation of solid and solution, and calculation of solubility.
4. Preparation of Sulfuric Acid Solutions: Preparation of sulfuric acid solutions of different concentrations, with details of volumes, concentrations, apparatus, and methods.
5. Recording Data: Construction of a table for recording experimental data on solubility and acid concentration, to evaluate how solubility depends on acid concentration.
6. Electrolysis of Copper(II) Sulphate: Experimental setup for electrolysis to determine the Faraday constant using copper(II) sulphate solution, with calculation of charge and mass of copper deposited on the cathode.
7. Graphing and Data Analysis: Construction of graphs to visualize the relationship between charge passed and copper deposited, identification of anomalous data points, and evaluation of the experimental procedure for determining the Faraday constant.
8. Suggestions for Improving the Procedure: Addressing the limitations of the balance used in the experiment and suggestions for improving accuracy, including the use of a more precise analytical balance.
9. Alternative Measurements: Suggestions for additional measurements to confirm the Faraday constant using different experimental approaches.
10. Interpretation of Results: Analysis of the experimental data and discussion of the suitability of the experimental setup for determining the Faraday constant.