[Jewelry making - Article 00236] - Re: [Orchid] Sparex No 2 101

[leonid surpin]

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>     I don't understand. For our chemistry profs out there, please
>     explain to me how it is that H2SO4 is stored in glass containers
>     (certainly with plugs). I recall from Chem lab, that chemical
>     reactions are generally carried out in Pyrex type glassware. 

    In the lab things are mixed so they will be used up in the reaction.
    Some excess are taking care by the exhaust hood. Boiling precious
    metal in the acid will not used up the acid. If one inhale the fumes,
    this is not a good idea and in time can have serious consequences.
    Boiling process also drives small particle of the acid in the air and
    that gets in the lungs. Doing it in copper vessel, acid is used up
    reacting with copper and the result is copper sulphide and water.
    That is the difference. Of course exhaust hood is recommended in
    either case. I never meant to create an impression that sulphuric
    acid reacts with glass. 

Leonid Surpin.
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