[Bio] pH probe confusion

Rikke Rasmussen rikke.c.rasmussen at gmail.com
Thu Apr 14 16:19:41 PDT 2011


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
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