The student's description of the main topic is slightly vague and could be improved by directly highlighting what the term "concentration" concerns. The research question is also slightly vague and could be improved by directly stating what the term "concentration" concerns. However, the student provides relevant and focused background information, explaining the key concepts necessary for understanding the investigation. The chemistry is well-explained, making it easy for the reader to understand without the need for rereading. The methodology of the investigation is highly appropriate and focused on answering the research question. The student also shows awareness of safety hazards, ethical concerns, and environmental issues that can arise during the experiment.
