At 10:40 AM 4/15/2004 +0200, you wrote:
>As to the content of the stomach: I apologize, that sulphuric acid in the
>stomach was maybe some trash. I shall see what happenes in the stomach
>exactly.
>But: I still consider the silver to be pretty reactive:
>1. When you leave it on the air, it turns black within some days. It´s the
>matter of the hydrogen sulphide content in the air and silver sulphide
>appears on the silver surfaces.
## It's more liley the oxidation of the ionic siver on contact with air.
If you let ionic silver dry, the ions form oxides and leave a brown to
black stain.
>This, maybe is also answer to that, why sometimes the electrodes turn dark
>during the batch process. I suppose, that dissolved gasses in the DW can
>react with the electrode surface.
## I've found that ozone in the water tends to make otherwise colorless
CS turn out yellow to brownish whereas letting that same water open to vent
for a few days [gas bubbles formed on the sides of the container] yielded
different results.
>As I was informed, the best way to get out the gasses from the DW is to boil
>it shortly before starting the batch.
## That ought to do it.
>Can I ask somebody who faces this problem with the electrodes colour change
>to try this if it works ??????????????
## One electrode will turn black because it's emmitting oxygen..the other
emits hydrogen.
The oxygen formed at that electrode instantly reacts with some of the
silver ions to make silver oxides and maybe silver peroxides.
>2. Ocassionaly I work with plated silver material and if even I touch it
>with my hand, an exact fingerprint turns dark in several minutes on the
>silver surface. So, I must handle it wearing gloves. There are some
>chemicals in the sweat, that silver reacts with almost instantly. It seems,
>as if it is developed photographic image of my fingerprints.
## This is probably due to sulpher compounds in the sweat. You eat lots of
eggs?
>3. As to the reactions with the acids, as below: It is true, there is no
>reaction with the hydrochloric acid.
>If you pour sulphuric acid over silver plate, there is but a slight
>reaction, where the silver sulphate appears covering the whole surface and
>as it is not soluble, it makes passivating (= insulating) layer over the
>silver. Thus the more reaction is suppressed, the silver surface is
>"passivated". In case of CS might the situation be quite different...
>As to the fuming nitric, the silver dissolves absolutely in violent
>reaction, with the sulphur nitrate resulting from this reaction.
>I have asked for the above information my friend - he´s chemist.
>So the answer to the Peter´ s question is: It was fuming nitric what
>violated your silver chain.
## Even chemists don't remember everything accurately. Check it out again
from another source or try it yourself. {Not saying he's wrong seeing that
silver nitrate isn't all too hard to make}
Ode
>Pavel H.
>
>
>Marshall Wrote
>
>silver is one of the most inert metals there is, it is slightly more
>reactive than gold, but
>not much. You can drop it into fuming nitric, sulfuric and hydrochloric
>acids
>(independently) and nothing happens.
>
>Marshal:
>
>As a child once I try to clean a silver chain in an Ounce of the acid
>tinners use to solder. The chain completely dissolved after a few minutes.
>
>What kind of acid do You think it was?
>
>Peter R
>
>
>
>
>
>--
>The Silver List is a moderated forum for discussing Colloidal Silver.
>
>Instructions for unsubscribing are posted at: http://silverlist.org
>
>To post, address your message to: [email protected]
>Silver List archive: http://escribe.com/health/thesilverlist/index.html
>
>Address Off-Topic messages to: [email protected]
>OT Archive: http://escribe.com/health/silverofftopiclist/index.html
>
>List maintainer: Mike Devour <[email protected]>
>
>
