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Re: Experimenting this Week
a.silbermann Views: 2,284
Published: 10 years ago
This is a reply to # 2,069,384

Re: Experimenting this Week


The Hydrogen Peroxide reaction with metallic silver is well known from the earliest days of rocketry. Yes, large particles of metallic silver are made smaller by H202.

Orr, Dalla Valle, et al, wrote on the presence of color in Colloidal Silver in visible light in 1959. Their paper stated that color appears with particle sizes that are 200 nanometers (0.2 microns) or larger. So the H202 reaction made the metallic silver particles smaller than 200 nanometers, and thus the smaller particles size (more being made by the addition) scatter the light more effectively with higher surface area so the silver became clear. The large particles in your "really good stuff" just got smaller, and the color disappeared as a result.

I mixed H2O2 (Hydrogen-Peroxid) many times with Silver ions, my results contradict those individuals who are "knowledgeable in the field."
Silver Oxide never formed once, which is practically insoluble in water and would have precipitated out of suspension.

Hydrogen Peroxide is oxidized by Silver oxide and the Silver Oxide is reduced to metallic silver. If Silver Oxide had been formed by the addition of H2O2 (Hydrogen-Peroxid) it would have been immediately reduced into Metallic Silver. Silver oxide on the other hand, is reduced to metallic silver while liquid water and Oxygen gas are also produced.

Ag2O(s) + H2O2(aq) → 2Ag(s) + H2O(l) + O2(g)

Silver oxide is commercially prepared by combining aqueous solutions of silver nitrate and an alkali hydroxide.

I recommend those "knowledgeable in the field" should take a remedial high school chemistry refresher course.

At the same time please ask the two makers of "true Colloidal Silver " if they ever found a definition for "true colloid" in a credible reference source such as an encyclopedia, chemistry or physics reference/text book.


PS I can find a definition for colloidal electrolyte at the IUPAC Goldbook:

colloidal electrolyte,

An electrolyte which gives ions of which at least one is of colloidal size. This term therefore includes hydrophobic sols, ionic association colloids, and polyelectrolytes.


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