In a message dated 6/17/00 2:50:59 AM EST, [email protected] writes: << Hi folks, I originally thought that this reaction might be an indication of the metallic content (uncharged or slightly charged silver aggregates) of colloidal silver. This proved to be so in the tests I performed. Fred has attempted to refine the concept by quantifying the gas released, but unfortunately there is not a great deal of gas evolution, although there seems to be a gas phase which is plain to see. The silver - hydrogen peroxide catalytic effect really only occurs with high purity H2O2 (> 90%) being pumped through silver mesh.
Ivan: This type of contact is hardly that which is occurring when (I believe 3%) H2O2 is added to freshly made CS. So how can anyone claim that (3%) peroxide can be used to identify metallic silver in CS? Also it's very confusing to me how the term catalyzed reaction is being used (probably not by you). I thought a catalyst is something that PROMOTES a reaction without TAKING PART in that reaction. The reaction below clearly show that silver is one of the reactants. On the other hand, is it not possible that silver DOES catalyze the reduction of (relatively unstable) H2O2? Your comments please. H2O2 will oxidise metallic silver Ag 2(Ag) + H2O2 + 2H+ + 2e > 2(Ag+ + e) + 2H2O E(cell) = 0.977 V log K = 33.06168 K = 1.15e33 deltaG= -188.53169 kJ/mol but will not oxidise the silver ion Ag+ in a neutral or acid solution. In a basic solution H2O2 will reduce Ag+ by way of the hydroxyl ion OH- surfiet. Ivan: How basic (pH?) does the solution have to be to get this reaction to the right? H2O2 + 2OH- + 2(Ag+ + e) > O2 + 2H2O + 2e + 2(Ag) E(cell) = 0.945 V log K = 31.9788 K = 9.52e31 deltaG = -182.35665 kJ/mol >> -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
