Chemistry 9701/51 Oct Nov 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of the reaction between sodium chloride and lead nitrate to confirm stoichiometry, with a focus on how the number of moles of PbCl₂ changes as NaCl moles are increased.
2. Planning of experiments to measure precipitate mass, control of variables like the concentration of lead nitrate, and titration of sodium chloride for stoichiometric analysis.
3. Graphical analysis of precipitate mass vs. NaCl concentration, predictions about reaction limits, and methods to accurately determine the stoichiometric relationship.
4. Preparation of solutions with known concentrations, precise measurement of volumes for titrations, and step-by-step procedures for drying the precipitate after filtration.
5. Qualitative analysis using standard reagents to identify cations and anions in various test solutions, employing methods like precipitation and heating for accurate identification.