[modeleng] Re: Pickle
- From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 5 Oct 2004 23:14:57 +0100
Hi Tim
Nice to hear from you again, and thanks for the advice. I have plenty of
caustic soda crystals - would they be effective in neutralising the acid?
Also, short of going out and buying litmus paper, how can I tell when it's
neutral?
Regards
Ron
----- Original Message -----
From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, October 05, 2004 11:51 AM
Subject: [modeleng] Re: Pickle
> Errm sorry Ron.
>
> I'm not certain that there is any point in sticking ferrous scrap in
> before
> adding washing soda. The idea was that you'd swap the soluble copper ions
> for iron ions. Then as the pH increases the iron ions (I love that) become
> insoluble. However copper ions are also going to be insoluble at highish
> pH
> so they'll crash out too I expect. I think the main message is if it is
> still coloured it is going to have dissolved metal in it and that is not
> going to please the water company. How do I know this? Well once upon a
> time
> someone I know quite well (Lets call him the_viffer) killed most of the
> local sewage works flora off by sticking a fair amount of soluble chromium
> salts down the sink at the research lab he worked at.
>
> Don't use ammonia as the neutralising agent tho' as it reacts with the
> copper ions to form a pretty but soluble complex ion.
>
>
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