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Discussion in 'B&W: Film, Paper, Chemistry' started by glbeas, May 31, 2005.
What is the difference between the bisulfite and the metabisulfite, if any?
There is a bit about this on Ryuji Suzuki's site:
Thanks! Quite interesting how that works out.
Likely one difference is the temperature of crystallization; the
meta being precipitated at higher temperatures. A dehydration
takes place. A combining of two orthos into one meta minus one
H2O is the result. The metabisulfite is two bisulfites minus a H2O.
Or, 2,NaHSO3 = Na2S2O5 + H2O.
Borates do the same thing, dehydrate; ortho, meta, tetra. Of
course they also hydrate; metabisulfite, with water, will become
the bisulfite. Dan