Tom,
What was the color of your solution before and after adding ascorbic
acid? Did the color change after the precipitated occurred?
Thanks,
Steve N
-----Original Message-----
From: poast [mailto:[email protected]]
Sent: Wednesday, March 17, 2010 9:10 AM
To: [email protected]
Subject: Re: CS>Making 100% colloidal EIS
Hello Marshall,
Some additional information...
My EIS ends up with a PH of 6.5. The solution that I added the ascorbic
acid to ended up with a PH of 3.5.
I know that some reactions are sensitive to PH, so an idea would be to
pick
a PH target and add only as much ascorbic acid as is needed to reduce
the PH
of the solution to the target value.
I used a "pinch" of ascorbic acid in 250 ml of EIS. I have measuring
spoons
that measure a drop, smidgen, pinch, dash, and tad. In liquid
measurement a
pinch is 0.3125 ml. I just measured a pinch of ascorbic acid and it
came in
at 0.31 grams.
Too much? Too little? Normal reaction?
Tom
----- Original Message -----
From: "Marshall Dudley" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 16, 2010 12:37 PM
Subject: Re: CS>Making 100% colloidal EIS
> That is some good information. I was wondering if the addition of
> ascorbic acid would cause 1 and 2 atom colloid, or if it would
> precipitate out on the particles that are already there, that
indicates
> that at least some of them precipitate out on other particles making
the
> rather large. The other possibility would be that the remaining
> ascorbic acid made the solution acid enough to make the colloid
> unstable. I need to test and see if I neutralize the free acid if the
> same thing happens.
>
> Marshall
>
> poast wrote:
> > Hello Marshall,
> >
> > 3 days ago I put a pinch of ascorbic acid in some EIS and have
stored
this
> > solution in a white 250 ml HDPE bottle. I took the lid off this
morning
and
> > noticed that some of the silver had precipitated out. I shook the
bottle
> > and it went back into solution.
> >
> > There wasn't a large quantity, but against the white bottom it was
evident
> > that there was some.
> >
> > I am using the SG6. My EIS comes out at around 15 uS, then settles
down
to
> > about 11.5 uS in a few days.
> >
> > Tom
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