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I know it's off topic: but I am curious and this sounds both challenging to search for and likely to not get a straight answer from an LLM. Do you happen to know if this means that water may tip from neutral to slightly alkaline or acidic at different temperatures or pressures?

I have always found it .. peculiar that water just so happens to (as you aptly put it) "have all the activities of hydrogen ions and hydroxide ions equal" :)

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This isn't a difficult question. I'm sure LLM knows these things better than I do.

Water is H-O-H; H+ and OH- both come from water. If there are no impurities, then for every extra H+ there is an extra OH-, so it's not that they are "happen to be equal". They're born equal.

Changing the temperature does change the concentrations of these ions so pH does change by definition. But the water remains neutral, since the ratio of H⁺ to OH⁻ is still 1:1

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