The student clearly states the independent and dependent variables in the research question, including their values and appropriate units. Additionally, the student describes the method of analysis conducted and includes a background theory section closely related to the research question. The document also includes a clear explanation of the choice of techniques used for measuring the independent and dependent variables, as well as a justification for the chosen method of investigation. However, the student needs to provide scientific sources regarding foods' pKa values to substantiate the choice of pKa values, and to state the exact value of "room temperature" as a controlled variable. Furthermore, the student should address safety issues associated with handling glassware to minimize risks. Overall, the methodology is sufficiently described and detailed, allowing for the investigation to be reproduced.
