Hard to tell exactly; the package is marked "sodium bisulfate".
Since it's a plastic bottle, labeled "pH Down" for spas, I don't
think they were overly concerned with technical accuracy!
Roy
--- In 7x12minilathe@..., andrew franks <andyf1108@...>
wrote:
Hello Folks,
To be pedantic, I think that the sterilising stuff is sodium
metabisulphite (Na2 S2 O5), rather than metabisulphate, but I don't
suppose that would make any practical difference. I might also
experiment with sulphuric (battery) acid. When I made my first
attempts at anodising, it seemed to leave the aluminium alone (no
doubt because of the oxide layer), so maybe that would attack the
broken tap and not the aluminium alloy it was stuck in. I suppose an
initial rinse in solvent would help, by getting rid of any cutting
oil and allowing the chosen chemical to get at the steel.
Andy
roylowenthal <roylowenthal@...> wrote:
Yup! That's the same sodium bisulphate as the pH down
product for
pools/spas. It's quicker than alum (any of the common variants) &
easy to get.
Roy
--- In 7x12minilathe@..., Victoria Welch <wrlabs@>
wrote:
On Thursday 05 April 2007, Ian Foster wrote:
G'day Jeff, Andy, et al.
I'm not quite sure by your comments whether you have used Sodium
Bisulphate to extract broken taps. If you have then that
substantiates my assessment that it is the sulphate ions which
do
the
work. Being a bisulphate the iron ions do not need to displace
the
sodium ions to form sodium hydroxide (corrosive to aluminium),
they
just neutralise the solution forming iron sulphate and sodium
sulphate.
[ ... ]
Found this at my local homebrew store:
productid=285&cat=0&page=1
Would that work?
Convenient place to get to (something special in Seattle) and I
do
already go there from time to time.
Embarrassed to admit what chemistry I did take has long since
been
forgotten <blush>.
Thanks & take care, Vikki.
--
Victoria Welch, WV9K/7
It is my reading of history that Allah usually favours the army
with the
best firepower.-- The Warlord (_Ivory_, Mick Resnick)
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