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.
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.
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
Distribution of the Elements in Product Phases :
ELEMENT Ag mole gram per cent
cummulative
---------- ---- ---- -------- ---------
--
SOLUTION-GASES
Totals 0.0000 0.0000 0.0000 %
AQUEOUS
21 Ag[+](aq) 0.1000E-03 0.1079E-01 100.0 %
100.0 %
22 AgOH(aq) 0.1096E-16 0.1182E-14 0.1096E-10% 100.0
%
23 Ag(OH)2[-](aq) 0.5860E-31 0.6321E-29 0.5860E-25% 100.0
%
Totals 0.1000E-03 0.1079E-01 100.0 %
PURE SPECIES
Totals 0.0000 0.0000 0.0000 %
TOTAL Ag 0.1000E-03 0.1079E-01
------------------------------------------------------------------------
--
ELEMENT O mole gram per cent
cummulative
---------- ---- ---- -------- ---------
--
SOLUTION-GASES
Totals 0.0000 0.0000 0.0000 %
AQUEOUS
14 H2O(l) 55.51 888.1
100.0 % 100.0 %
17 O2(aq) 0.9500E-03 0.1520E-01 0.1711E-02%
100.0 %
18 OH[-](aq) 0.1000E-03 0.1600E-02 0.1801E-03%
100.0 %
19 HO2[-](aq) 0.1951E-19 0.3122E-18 0.3515E-19%
100.0 %
20 HOOH(aq) 0.1011E-17 0.1618E-16 0.1822E-17% 100.0
%
22 AgOH(aq) 0.1096E-16 0.1753E-15 0.1974E-16%
100.0 %
23 Ag(OH)2[-](aq) 0.1172E-30 0.1875E-29 0.2111E-30% 100.0
%
Totals 55.51 888.1
100.0 %
PURE SPECIES
Totals 0.0000 0.0000 0.0000 %
TOTAL O 55.51 888.1
------------------------------------------------------------------------
--
ELEMENT H mole gram per cent
cummulative
---------- ---- ---- -------- ---------
--
SOLUTION-GASES
Totals 0.0000 0.0000 0.0000 %
AQUEOUS
14 H2O(l) 111.0 111.9 100.0 %
100.0 %
15 H[+](aq) 0.1043E-09 0.1051E-09 0.9392E-10%
100.0 %
16 H2(aq) 0.8031E-44 0.8095E-44 0.7234E-44%
100.0 %
18 OH[-](aq) 0.1000E-03 0.1008E-03 0.9008E-04%
100.0 %
19 HO2[-](aq) 0.9755E-20 0.9832E-20 0.8787E-20%
100.0 %
20 HOOH(aq) 0.1011E-17 0.1019E-17 0.9110E-18% 100.0
%
22 AgOH(aq) 0.1096E-16 0.1104E-16 0.9870E-17% 100.0
%
23 Ag(OH)2[-](aq) 0.1172E-30 0.1181E-30 0.1056E-30% 100.0
%
Totals 111.0 111.9 100.0 %
PURE SPECIES
Totals 0.0000 0.0000 0.0000 %
TOTAL H 111.0 111.9
------------------------------------------------------------------------
--
--
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