[Jewelry making - Article 00074] - Re: [Orchid] Utility Sink, Hard or Soft Water?

[John Burgess]

========[ Invite a Friend - http://www.ganoksin.com/invite.htm  ]========


    G'day;  Regarding my earlier posting on the subject, I should get
    brain into gear before pressing the send button.  # AT $%& AT !! 

    Calcium carbonate is not soluble in water; calcium bicarbonate is,
    and it is calcium bicarbonate which causes temporary water hardness.
    It is called temporary hardness because on heating the water the
    bicarbonate is converted to calcium carbonate which being insoluble
    causes the deposit in kettles and hot water pipes, leaving the water
    soft. Permanent hardness is caused by the presence of calcium
    SULPHATE which cannot be removed by boiling. The addition of ammonia
    or washing soda will help produce a lather in the presence of calcium
    sulphate. 

    Another way to remove salts from water is by what is called reverse
    osmosis.  That is a special membrane is made which is porous, but the
    holes in it are so small that they will let only water molecules
    through under pressure, leaving salt behind. This is now included in
    all lifeboats. I didn't mention distillation because that is very
    expensive. 

    I am sorry about the nonsense.   Perhaps I should just shut up and
    stay quiet. 

-- 
Cheers for now,
John Burgess;   johnb AT ts.co.nz of Mapua Nelson NZ


____________________________________________________________________
T h e   O r c h i d   L i s t
Open Electronic Forum for Jewelry Manufacturing Methods and Procedures
____________________________________________________________________
Orchid FAQ:
~ http://www.ganoksin.com/orchid/faq.htm
Orchid Archives:
~ http://www.ganoksin.com/orchid/archive
Orchid Galleries:
~ http://www.ganoksin.com/orchid/gallery.htm
Invite a Friend:
~ http://www.ganoksin.com/invite.htm
____________________________________________________________________
Tips From The Jeweler's Bench - Article Archive
~ http://www.ganoksin.com/borisat/tip_sear.htm
The Jeweler's Selected Bibliography List
~ http://www.ganoksin.com/jewelry-books
Buy Orchid Jewelry:
~ http://www.ganoksin.com/shop
____________________________________________________________________
-Unsubscribe:
-Email: orchid-request AT ganoksin.com Body=unsubscribe subject=blank
____________________________________________________________________