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  1. #1
    glbeas's Avatar
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    chemical question

    What is the difference between the bisulfite and the metabisulfite, if any?
    Gary Beasley

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    There is a bit about this on Ryuji Suzuki's site:

    http://silvergrain.org/Photo-Tech/ch...misnomers.html

  3. #3
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    Thanks! Quite interesting how that works out.
    Gary Beasley

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    Quote Originally Posted by glbeas
    What is the difference between the bisulfite and
    the metabisulfite, if any?
    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



 

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