The student clearly stated the independent variable as the size of chicken eggs and the dependent variable as the mass of calcium carbonate in the eggshells. The research question effectively described the method of analysis, which involved back titration with hydrochloric acid and sodium hydroxide. However, the student needed to enhance the background theory section by including more detailed information about the significance of calcium carbonate in eggshells and the chemistry behind the titration process. Additionally, there was a lack of clarity regarding the techniques used for measuring the independent variable, as specific details about how egg sizes were determined were not sufficiently explained. Overall, the methodology was well-structured and allowed for reproducibility, while safety, ethical, and environmental considerations were appropriately addressed.
