Re: OK Stable pure water will be difficult to maintain but what ionic level will be?
From: Dieter Britz (britz_at_chem.au.dk)
Date: 01/07/05
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Date: Fri, 07 Jan 2005 13:37:32 +0100
WayneL wrote:
> Hi Dieter
>
> My latest work involves establishing my experimental parameter
> space. Thus I need to remove the atmosphere and then re-introduce it one
> gas/substance at a time. So flush out my chamber with argon and run my
> tests contaminated with "pure water" (the combs with several with AC and
> several with DC), then repeat with CO2 then N2 then O2 etc...
> For the Dc I will use a galvanostat/potentiostat and for the AC I will use
> an impedance spectrometer.
> So you can see why I need the pure water as I am trying to simulate the
> effect each of the atmospheric condition has on water. Water being the most
> likely vehicle of contamination for electrical good (not forgetting beer
> :-]).
I don't expect O2 or N2 to affect conductance, but CO2, yes.
> On another thread there was a discussion on overpotential(s). If I have two
> copper electrode and I need to find the overvoltage then won't they cancel
> each other out or do they add up so Cu2+(aq) + 2e- -> Cu(s) = 0.34 so is it
> 2x0.34 or 0.34-0.34 (or have I lost the plot?).
They are two different processes occuring at a given applied cell
voltage, the anodic reaction being dissolution of Cu, with its own
overpotential. They will be additive though.
-- Dieter Britz, Kemisk Institut, Aarhus Universitet, Danmark.
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