Re: CS>Adding peroxide to CS

Sat, 21 Aug 2004 10:22:37 -0700

I think I have this straight but check me on it.
Silver hydroxide..a white stable insoluble powder ...a compound.
Silver hydroxl...an association of water with silver ions..in essence, that hydrated or 'dissolved' ionic silver..not quite a "compound" ..a charge influence rather than an electron sharing?

Last I heard silver oxide isn't all that soluable in water and is most often black in color...[looking]

Oh golly, mounting complexities..........

>From Van Nostrands Scientific encyclopedia:
"Silver [1] oxide, the normal oxide of silver, Ag2O Made by action of Oxygen under pressure on silver at 300 deg C, or by precipitation of a silver salt with carbonate free alkali metal hydroxide." [soluable]



"Silver [11] oxide, AgO is formed when ozone reacts with silver and thus was once considered to be a peroxide." [slightly soluable] Most distilled water is "ozonated" What forms do Oxygen take on that anode?
What does Hydrogen Peroxide do to ozone and silver peroxides? I have made deep brownish yellow CS in fresh commercial distilled that didn't do the same thing after that water had been allowed to vent..gas bubbles formed on sides of jug.

"Silver [111] oxide, Ag2O3 has been obtained in impure state by anodic oxidation of silver." [Color/ is or isn't soluable???..no info. ]

Then other mentions of Ag3O4 [in German] as an 'Elektrokristallisation' and a few vague references in plasma sciences [Google]
A silver [1111] oxide? Can't find soluability or colors.

Uh oh... 'Science' also has a cross mix of names. No wonder this is confusing.

http://www.webelements.com
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silver (I, III) oxide

* Formula as commonly written: AgO
* Hill system formula: Ag1O1
* CAS registry number: [1301-96-8]
* Formula weight: 123.868
* Class: oxide

Synonyms

* silver (I, III) oxide
* silver oxide
* argentic oxide
* Dirasil
* silver peroxide

Physical properties

* Colour: charcoal gray powder
black crystal Grayson 1983
Windholz 1983
* Appearance: crystalline solid
* Melting point: >100°C (decomposes to Ag and oxygen gas)
solubility/water @20C decomposes in water Windholz 1983

###############################
silver (I) oxide

* Formula as commonly written: Ag2O
* Hill system formula: Ag2O1
* CAS registry number: [20667-12-3]
* Formula weight: 231.736
* Class: oxide

Synonyms

* silver (I) oxide
* silver oxide
* disilver oxide

Physical properties

* Colour: black to brown black
* Appearance: crystalline solid
* Melting point: 460°C (under 1 atmosphere oxygen)
solubility/water @25C 22 mg/L Grayson 1983
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Some might find this interesting. Not quite "our" conditions.
[examples] After the electrolysis has continued for a short time, it may be interesting to disconnect the power source and connect the electrodes with a short-circuit. The original anode becomes a cathode, and it is possible to watch partial reversal of the original electrolytic reactions.


It is clear that the oxidation of Ag(I) to Ag(III) occurs more easily than oxidation of hydroxide to oxygen under the conditions provided.

http://chem.lapeer.org/chem2docs/silver.html

OK, that's enough. I've boggled my little mind.
Ode
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At 05:18 PM 8/20/2004 -0400, you wrote:
>Mike Monett wrote:
>
>> So the basic conclusions remain as before. The black stuff is oxide.
>
>Scrape off a small amount of the black stuff, and put it in a glass of
>distilled water and warm. If it dissolves slowly, it is silver oxide, if
>it does not then it is either silver peroxide, or finely divided silver
>powder. If it conducts electricity, it silver metal.
>
>Marshall
>
>
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