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pH decreases with increase in temperature. But this does not mean that water becomes more acidic at higher temperatures. In the case of pure water, there are always the same concentration of hydrogen ions and hydroxide ions and hence, the water is still neutral (even if its pH changes)
When we increase the temperature, water's ability to ionize increases, so [H+] increases, which means pH decreases. Essentially, a record of a pH value without a corresponding temperature value is not enough information in something like a lab report. If it is just water by itself, I don't think temperature will affect the pH level of water; I believe pure H2O will always be pH 7.
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