Chemistry / Chem 1821 · Atom · ~20 seconds
Kw's Temperature Dependence
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Kw is temperature-dependent, since water's autoionization is endothermic, so Kw grows and neutral pH drops below 7 as temperature rises above 25 °C.
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Hot water can measure below pH 7 while remaining perfectly neutral, since its own Kw has shifted.
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A pH below 7 signals acidic only relative to that temperature's neutral point, not always relative to 7.
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