The student demonstrates a strong understanding of the hard water concept and provides a detailed description of the main topic. The background information is relevant and focused, providing necessary information for the reader to understand the experiment. The chemistry is explained well, enabling the reader to fully understand the precipitation equations and the role of EDTA. The methodology is appropriate and focused on answering the research question, including steps to assure the relevancy and validity of the results. The student also shows full awareness of safety hazards, ethical concerns, and environmental issues that can arise during the experiment.
