The student clearly stated the independent variable (oxygen exposure duration) and the dependent variable (ethanoic acid concentration), and specified titration with standardized sodium hydroxide as the analytical method. Relevant background theory linked ethanol oxidation, acidity, and the titration procedure, while the sampling approach, trial numbers, measurement scope, controlled variables, and safety, ethical, and environmental considerations are explained. The methodology included sufficient materials and procedural detail to support replication and was presented without irrelevant or repetitive information. However, the student did not clearly explain how exposure time was measured or when the timing began, so the consistency of the exposure intervals could not be fully established.
