[Bio] pH probe confusion

[Rikke Rasmussen]

Hi Rolf,

Can't answer your question regarding the state of the probe, but regarding
the pH of vinegar, that depends entirely upon the concentration of acetic
acid <http://en.wikipedia.org/wiki/Acetic_acid> - white vinegar for cleaning
is usually 5% and has a pH of approx. 2.4. On the other end, you could test
any heavy-duty soap - wood oil soap ought to have pH of about 9 when diluted
along the lines of 1:20 (and you do need to dilute it to measure it), and if
you can find drain cleaner (sodium hydroxide, NaOH), it ought to have a pH
of about 11 (don't get it on your hands, alkaline burns are painful).

/Rikke

On Thu, Apr 14, 2011 at 11:08 PM, Rolf <rolfvw at gmail.com> wrote:

> Hi there Bio people,
>
> I just got this aquarium style pH probe.
> When it arrived, it had a lot of dried stuff all over it, like some
> kind of white powder.
> Then I realized that this was the KCL electrolyte that was supposed to
> stay in the little container that mounts on the end of the probe.
> Most of the liquid drained out of this container during shipping, although
> it doesn't appear that the membrane dried out.
>
> I have no experience with these things...
> Is the probe ruined?
>
> Also, does anyone know the pH of vinegar?  (the only thing I could
> think of for testing!)
>
> -rolf
> _______________________________________________
> Bio mailing list
> Bio at lists.noisebridge.net
> https://www.noisebridge.net/mailman/listinfo/bio
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.noisebridge.net/pipermail/bio/attachments/20110414/8010aa09/attachment-0001.html>