When you started you had particles of 40 to 50 nm in size, and a
concentration over 20 ppm of silver. When you added the H2O2 it
immediately broke up the big particles producing silver oxide and silver
hydroxide, but before it could convert most of that to 2 atom particles
it was used up, so you were left with a concentration of ionic silver
above the limit of solubility (25 or so ppm) which made it cloudy.
Adding another drop of H2O2 allowed some of the ionic silver to convert
to 2 atom colloid, thus clearing it up. As time went buy more of the
undissolved ionic silver either went back into solution or precipitated
out reducing the Tyndall.
Marshall
Dorothy Fitzpatrick wrote:
It was sitting for 48 hours sol when I noticed it had gone yellow (the 2nd
batch) I put in one drop of H202 and thats when it went cloudy. It cleared
after adding another drop though, and the ppm went up from 8 to 10ppm. I've
noticed that after another day sitting, that the tyndall is now weaker. Is
this because there are less ions now do you think? dee
On 13 Apr 2010, at 00:36, sol wrote:
Dorothy Fitzpatrick wrote:
Oh yes, and I meant to have said that the second batch had a very strong
tyndall even though it had a lower TDS reading than the one with the weak
tyndall. dee
So far as I know that is a typical situation. More particles, weaker
conductance (after the CS has stabilized) but you could actually have more
silver in that batch. Particles do not have conductance, ions do.
The stronger and wider and denser the tyndall the more likely a batch will go
cloudy when H202 is added, IF you don't add enough.
From my personal experience, if you add enough it will go clear eventually.
Also less likely to go cloudy at all if you let the CS sit for 48 or more hours
before adding the H202.
sol
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