[sdiy] Messy workshop and Into the future (was Old Age and Synth-DIYers)

[James Patchell]

This can get real exciting...I once put Sodium Hydroxide crystals (NaOH) 
into a bath of Ammonium PerSulfate and got quite a reaction....it began to 
really bubble, releasing ammonium gas.  But I did get the copper out of 
solution....it ended up as black mud on the bottom of the etch 
tank.....although, I wasn't trying to neutralize anything.  I wanted to see 
what would happen (I had a good idea).  A weaker solution of NaOH is 
recomended to prevent this....

         -Jim (basement chemist).....

At 05:39 PM 6/8/2004 +0200, René Schmitz wrote:


>Ian Fritz wrote:
>
>>I really don't know. Ferric chloride is an acid, so you can neuteralize 
>>it with baking soda, as I remember.  Any chemistry geniuses that know 
>>this  one?
>
>Its actually a salt, what ever you put in there you will still have the 
>iron and copper in there. The best you can hope for is an oxide or 
>something that isn't directly water solvable. But still these can react 
>with mild acids, like acid rain, and become solvable again.
>IMO the stuff still doesn't belong to the landfill but to the toxic waste 
>disposal!
>
>Neutralisation here only means that you get a pH of 7, not that the 
>solution does not pose a harm. Heavy metall ions are usually toxic.
>
>I know of a reaction that falls out the Copper in Cu2SO4, which is what 
>you get from using ammonium or soduim persulfate. You put in NaOH, and 
>heat it up. (The NaOH can be from your developer...) The copper does fall 
>out as black copper(II)oxide.
>
>Cheers,
>  René
>
>--
>uzs159 at uni-bonn.de
>http://www.uni-bonn.de/~uzs159
>

         -Jim
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