The student clearly stated the independent and dependent variables in the research question, identifying sodium chloride concentrations as the independent variable and the pH of rice water as the dependent variable. The methodology was well-defined, with a detailed explanation of the analysis method and the choice of techniques for measuring the variables, including the preparation of salt solutions and the use of a pH probe. The student effectively addressed controlled variables, safety, and environmental issues, ensuring a thorough understanding of the experimental conditions. However, the student failed to identify and address any ethical issues associated with the investigation that required clarification. Overall, the methodology was described sufficiently and was free of irrelevant or repetitive information, allowing for reproducibility.
