Chemistry 9701/53 May June 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of magnesium methanoate solubility through titration with potassium manganate(VII). Half-equations for redox reaction, calculation of methanoate ion concentration, preparation of diluted solutions, and sulfuric acid's role in the reaction.

2. End-point visualization in titration, calculation of ion concentrations from volume and molarity data, and determination of saturated magnesium methanoate solution concentration.

3. Effect of temperature on solubility and enthalpy implications (\\(\\Delta H\\)) for magnesium methanoate dissociation into ions. Independent and dependent variables for temperature experiments.

4. Challenges in titration with sulfuric acid for barium methanoate due to potential precipitation or reaction interference.

5. Equilibrium [removed]\\(K_c\\)) and calculations for hydrogen and iodine reaction forming hydrogen iodide. Graphical analysis for equilibrium constant determination and impact of temperature and flask size on reaction rate and \\(K_c\\).

6. Effect of increased temperature on exothermic reaction equilibrium and \\(K_c\\) value reduction, along with safety considerations for removing air in high-temperature systems.