Why is distilled water alkaline?

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Eugene Bezuidenhout

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Why is distilled water alkaline?
« on: 06/09/2009 13:30:04 »
Eugene Bezuidenhout asked the Naked Scientists:
   
I take it that the pH of distilled water is 7?

So why does distilled water have an alkalinity reading if there is no buffering salts in the distilled water?

Regards

Eugene

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Offline Chemistry4me

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Why is distilled water alkaline?
« Reply #1 on: 07/09/2009 03:46:21 »
Faulty pH meter? Dirty distillation equipment? Didn't do the distillation properly?
Could almost be anything.

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Offline Bored chemist

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Why is distilled water alkaline?
« Reply #2 on: 07/09/2009 19:41:33 »
The likely answer is that it's dissolving sodium silicate from the glassware.
Pure water rapidly becomes slightly acidic in air because it picks up CO2.
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