The student clearly stated the independent variable, which was the initial temperature of the Spinacia oleracea solution, and the dependent variable, the amount of Fe2+ released from spinach during back titration. The research question was well-defined, and the analysis method was thoroughly described, linking temperature changes to the reactivity of Fe²⁺. The student provided a comprehensive background in relevant theory, detailing the chemical processes and supporting the choice of measurement techniques. The relevant theory detailed the chemical processes and supported the choice of measurement techniques. Additionally, the methodology was described in sufficient detail, allowing reproducibility without irrelevant information, while controlled variables and safety issues were adequately addressed. However, the student did not identify any ethical issues associated with the investigation, which should have been included in the assessment.
