The student clearly stated the independent and dependent variables in the research question, identifying the exposure time of red cabbage anthocyanin extract to malic acid as the independent variable and the absorbance measured at 520 nm as the dependent variable. The methodology was thoroughly described, including the use of a UV-Vis spectrometer for analysis and a detailed explanation of the techniques and sampling methods employed. The student effectively discussed the controlled variables, safety measures, and ethical considerations associated with the investigation, and provided a comprehensive theoretical background relevant to the research question. However, there was a lack of detail on environmental issues, specifically the neutralization process for malic acid disposal. Overall, the methodology was well-structured and allowed for reproducibility of the investigation.
