Chemistry 9701/52 Oct Nov 2016 | Cambridge AS Level Past Papers With Mark Scheme

1. Titration and EDTA:
- Planning a titration experiment to determine the concentration of zinc ions in a solution using EDTA as a titrant.
- Explaining the role of buffer solutions and calculating the mass of hydrated disodium EDTA required for a standard solution.
- Describing how to prepare the standard solution and ensuring the accuracy and reliability of titration results.

2. Reaction of Hard Water with EDTA:
- Identifying hazards and precautions related to the use of chemicals such as sodium hydroxide and Solochrome Black.
- Calculating the concentrations of Ca²⁺ and Mg²⁺ ions in hard water based on titration results.

3. Benzenediazonium Chloride Hydrolysis:
- Analyzing the hydrolysis of benzenediazonium chloride, calculating the order of the reaction from experimental data, and plotting graphs to determine half-life.
- Discussing how temperature affects reaction rates and the accuracy of measurements at different temperatures.
- Identifying anomalies in experimental results and calculating the rate of reaction by determining the gradient of a tangent.

4. Experimental Setup and Analysis:
- Completing experimental setups for measuring gas volumes in reactions and understanding the effects of different conditions on experimental accuracy.
- Analyzing data to calculate the rate of reaction and determining the order of a reaction based on concentration and reaction rate.

This paper assesses your ability to design experiments, interpret data, and understand the implications of various conditions on chemical reactions.