The student clearly stated the independent variable as the type of citrus fruits and the dependent variable as the concentration of ascorbic acid, with a detailed description of the Iodometry Method used for analysis. The background theory provided was comprehensive and relevant, linking ascorbic acid's importance to health and detailing the iodometric titration method. However, the student did not adequately explain the techniques used for measuring the variables, which would enhance clarity. The student effectively discussed the choice of trials and measurements, identified controlled variables and their significance, and addressed safety, ethical, and environmental issues associated with the investigation. Overall, the methodology was described sufficiently to allow for reproducibility, with no irrelevant or repetitive information.
