1. The problem statement, all variables and given/known data If the text is too small, it reads: 'A student measured the pH of water at various temperatures using a pH meter and obtained the following results: (table showing pH decreasing as temperature increases) The student was unsure whether the results were accurate or if the pH meter was faulty. Using your knowledge of chemistry, discuss possible reasons for the results obtained.' From SQA Advanced Higher Chemistry 2013 Exam 2. Relevant equations n/a 3. The attempt at a solution I took this question to my teacher after seeing it in a past exam paper, and neither of us could come up with much of an explanation (in fairness, the teacher I asked specialises in practical rather than theory). We wondered if it was to do with entropy, as entropy increases with temperature. Looking at it again, I'm also thinking that maybe it's to do with the dissociation constant, as that would also be affected by temperature. The level I am currently studying is roughly equivalent to first year degree. Any help is appreciated.