Re: CS>Adding peroxide to CS
From: Mike Monett
Date: Thu, 19 Aug 2004 12:05:43
http://escribe.com/health/thesilverlist/m72701.html
Sorry, I goofed in a previous post when calculating
part-per-billion. I brew in 2 litre batches and use 1/2 tsp but
forgot to divide by two when converting tsp to milliliters. The
following should read "1/4 tsp". The end result is the same, about
40 ppm.
> Here are the calculations:
> 1/2 tsp H2O2 = 1.23 milliliters
> But, H2O2 used is 3% concentration, so the actual amount of H2O2 is
> 1.23 milliliters * 0.03 = 0.0369 milliliters H2O2
> Now, 1 ppm = 1 milliliter per litre
> So 0.0369 milliliters = 0.0369 ppm, or ~40 parts per billion
Only a very small amount is needed!
When you add H2O2 to cs containing silver oxide, the H2O2 acts as a
catalyst and is not consumed in the reaction:
2Ag2O + H2O2 --> 4Ag(+) + O2(g) + H2O2
However, if you add H2O2 to pure silver, the H2O2 is consumed:
2Ag + 2H2O2 --> 2Ag(+) + O2(g) + 2H2O
Since 40 ppb of H2O2 is sufficient to clear 20 ppm cs that has
turned yellow, this shows the particles are actually silver oxides
and not pure silver particles as was thought in the past.
The oxides are created when hydroxyl ions (OH-) combine with silver
ions (Ag+) in the Nernst Diffusion layer which is very close to the
surface of the electrodes.
Best Wishes,
Mike Monett
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