The student clearly stated the independent variable as the concentration of acetic acid in various types of vinegar and the dependent variable as the rate of enamel erosion, modeled by eggshell dissolution. The posed research question articulated the analysis method, utilizing titration to measure the concentration of acetic acid. The background theory was thorough and connected relevant concepts to the experiment, demonstrating a strong understanding of scientific principles. However, the student did not provide a clear explanation of the techniques used for measuring the variables or the choice of sampling technique, which needed to be addressed for improved clarity. The methodology was well-detailed, allowing for reproducibility, and all safety, ethical, and environmental considerations were appropriately identified and addressed.
