The student clearly stated the independent variable, the concentration of Brilliant Blue FCF, and the dependent variable, the absorbance measured at 630 nm. They described the analytical method, including the use of a Vernier spectrophotometer to determine reaction orders by varying dye concentration. The background theory was well developed, covering the chemical properties and relevance of the substances involved, as well as the reaction kinetics. The student provided a thorough explanation of the choice of techniques and sampling methods, and effectively discussed controlled variables and safety issues. However, they did not adequately address ethical or environmental issues, which detracted from the investigation's overall comprehensiveness.
