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!
Originally Posted by doughowk
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."
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