[Jewelry making - Article 00221] - Re: [Orchid] Sparex No 2 101

[Helen Hill]

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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. I've
>     been using Pyrex beakers with watch glass covers. This leaves a
>     small opening where the spout is located in the beaker's lip, which
>     would allow some fumes to escape. 

    I don't quite get what bit you don't understand? Yes sulphuric acid
    is kept in glass jars, chemically resistant glass jars, usually
    brown which protects light sensitive chemicals. Sulphuric acid is
    obviously very dangerous and its fumes can cause severe respiratory
    injury and at worst death as Leonid points out. That's why such
    reactions we conducted at university were ALWAYS carried out in a
    fume cupboard which had a very powerful vacuum extraction system,
    sucking the fumes up out of the building into the atmosphere. That's
    presumably also why most jewellers use safer pickles such as pHDown
    and the like. It would NOT be a good idea to conduct chemical
    reactions with conc. sulphuric on the open bench using glassware with
    an open spout. Leonid appears to be saying that if you use a pure
    copper vessel, any excess sulphate ions will react with the copper
    and produce harmless copper sulphate and so not pose a danger to
    one's health. 

Pickle safely.

Helen
UK
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