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  1. #1

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    Precipitate in Sulfte solution

    I've made up a solution of Sodium sulfite (anhydrous) at 30g/l ... it seemed fully dissolved and perfectly clear when I decanted from the mixing vessel to the storage bottle, but within a few hours a soft white precipitate formed at the bottom. I used water from an ordinary kitchen filter jug at room temperature. The sulfite was purchased from a reputable supplier of photographic chemicals.

    I can easily run the solution through a filter it of course, but why should this have happened?

    Would using Sodium hexametaphosphate (or similar) in the water, or deionised water, help avoid the formation of precipitate?

  2. #2

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    If you used tap water then the white precipitate is probably calcium sulfite. Next time use distilled or de-ionized water.
    Last edited by Gerald C Koch; 08-28-2013 at 10:10 PM. Click to view previous post history.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  3. #3

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    Thank you Gerald



 

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