The student stated the independent variable as the brand of calcium carbonate-based antacid tablets and the dependent variable as the mass of calcium carbonate per tablet, with clear references throughout the IA. The methodology was well described, including the sampling technique and controlled variables, ensuring the reproducibility of the investigation. Although the student effectively discussed aspects such as the number of trials and measurement precision, there was a lack of detailed explanation of the techniques used to measure the independent and dependent variables. Additionally, while the student identified safety and environmental concerns, they needed to expand on ethical considerations to demonstrate a comprehensive understanding of all relevant issues. Overall, the student showed a solid grasp of the methodology and its components, but needed more elaboration in specific areas.
