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  1. #41

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    You can add citric acid to Na4.EDTA *until you reach pH 3-4*, only then you can use it as the first clearing bath. Sodium sulfite and Na4.EDTA are both alkaline in solution, therefore, that (I mean combining the two) won't work the way you've thought!

    Regards,
    Loris.

  2. #42
    Marco B's Avatar
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    Quote Originally Posted by doughowk View Post
    I read somewhere that the addition of sodium sulfite to tetra EDTA effectively created disodium EDTA. Can anyone confirm this? Disodium EDTA is rather expensive, which motivates my question.
    Hi Doug,

    I forwarded your question to Mike Ware. Here is his answer:

    "No, it doesn't. This is an issue of pH. The way to create a solution of Na2EDTA from Na4EDTA is to dissolve the free acid, H4EDTA itself, in it, in equimolar amount."

    Marco
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    "The nineteenth century began by believing that what was reasonable was true, and it wound up by believing that what it saw a photograph of, was true." - William M. Ivins Jr.

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