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distilled water is stored in acidic condition

distilled water is stored in acidic condition - Molecular Biology Techniques

distilled water is stored in acidic condition - Molecular Biology Forum. Includes forums for common molecular biology techniques.


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Old 02-20-2008, 10:32 AM
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Question distilled water is stored in acidic condition



hi,
can anyone tell me the reason why we stored distilled water in acidic condition?
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Old 02-20-2008, 05:40 PM
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Default Re: distilled water is stored in acidic condition

I'm not exactly sure what you're asking, but here's a tidbit of information:

Pure water has a pH of 7.0. However, water stored in the presence of air contains dissolved carbon dioxide which forms carbonic acid in solution. Therefore, once it's been stored for a while, even distilled water's pH will drop. For discussion of this, see [Only registered users see links. ] and [Only registered users see links. ].
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Old 02-21-2008, 11:30 AM
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Default Re: distilled water is stored in acidic condition

hi,
i want to know if we use the ds water once,can we use the remaining distilled water or there is any need to take new one(ds water).if we open the cap of gallon what will be the effect of medium mean to say what will be the effect of CO2 present in air.
padma
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Old 02-21-2008, 07:41 PM
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Default Re: distilled water is stored in acidic condition

If you're adding any sort of buffering agent to the water, I wouldn't worry about the pH drop. The whole point of buffers is to prevent pH change.

If you're storing nucleic acids (DNA, RNA) I would strongly suggest using a buffer rather than plain water, for this very reason (pH changes leading to chemical degradation).
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Old 07-25-2008, 01:12 PM
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Default Re: distilled water is stored in acidic condition

Due to high purity of disttilled water pH value is totally unstable ,in air tight container it may remain stable.
Mukesh
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