The student clearly stated the independent variable as the type of acid-suppressing medication and the dependent variable as the pH change of the hydrochloric acid solution, demonstrating a solid understanding of the research question. The methodology was well-described, detailing the steps for measuring pH changes and the materials used, which enabled reproducibility of the investigation. The student effectively discussed controlled variables, safety, ethical, and environmental issues associated with the investigation, ensuring a comprehensive approach. The discussion of trials and measurement precision further emphasized the reliability and quality of the data collected. Overall, the student provided a thorough and coherent methodology relevant to the research question.
