The student clearly stated the independent variable (temperature) and dependent variable (pH level of Cola) in the research question, demonstrating a solid understanding of the variables involved. The methodology was well described, including the use of a pH probe and a hot plate to control temperature, allowing for reproducibility of the experiment. The student also effectively discussed the selection of controlled variables and the rationale for their choice, ensuring the integrity of the results. Additionally, the student addressed safety, ethical, and environmental concerns related to the investigation, showcasing a comprehensive approach to the research process. However, the explanation of the techniques used to measure pH was lacking in detail and would be improved for clarity.
