[pure-silver] Re: Hypo Clearing: citric acid or sodium citrate?
- From: Jordan Wosnick <jwosnick@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 27 Apr 2007 19:19:37 -0400
John,
More than a slight effect on pH. Solutions of citric acid are acidic,
whereas solutions of sodium citrate are alkaline (salt of a weak acid).
My guess is that if citric acid is added to hypo clear, it is done for
pH control, in which case sodium citrate is not an acceptable substitute.
Bisulfite and sulfite form a buffer, but if the citric acid
concentration is high, the buffer system can easily be overwhelmed.
(Buffers have a fixed capacity.)
Jordan
john stockdale wrote:
Forgive me if I've been inattentive, but is it citric acid or sodium
citrate that's added to hypo clear? I seem to have references to
both. Or doesn't it make much difference? Citric acid is very easy
to obtain.
My schoolboy chemistry suggests that either becomes citrate ions in
solution and the rest of it (sodium ions or H+) might have a slight
effect on the pH and nothing more. And if the sulphite +
metabisulphite forms a buffered solution then the effect on pH would
be insignificant.
Can someone confirm or correct
me?=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to
your account (the same e-mail address and password you set-up when you
subscribed,) and unsubscribe from there.
--
Jordan Wosnick
jwosnick@xxxxxxxxxxx
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
