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Topic: pH of Water Confusion  (Read 1601 times)

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Offline offlinedoctor

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pH of Water Confusion
« on: September 25, 2012, 04:14:56 AM »
For the self-ionisation of water, why is it that, increasing
temperature would increase concentration of Hydronium and therefore
decrease pH, yet the solution remains neutral still?
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Offline Dan

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Re: pH of Water Confusion
« Reply #1 on: September 25, 2012, 04:42:28 AM »
See: http://www.chemguide.co.uk/physical/acidbaseeqia/kw.html

The pH of neutral water depends on Kw, which is temperature dependent - i.e. the reference point for neutral pH is not static, it varies with temperature. pH 7 is neutral at room temperature (~25°C),  but at 100°C neutral pH is ~6.
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Offline Borek

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Re: pH of Water Confusion
« Reply #2 on: September 25, 2012, 08:13:43 AM »
Neutral means [H+] = [OH-].
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