Automatic decolorization after the concentration of wet phosphoric acid

2012-02-22View Original

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Hello everyone. Today we conducted an experiment involving the wet extraction of dilute phosphoric acid (24% P2O5, flesh-colored). After concentration under normal pressure, the color disappeared automatically. Could anyone please explain why this happened?

Reply #22012-02-24

Check whether your dilute acid contains iodides; the concentrated iodides have been vaporized away

Reply #32013-10-21

I’ve encountered this problem too; I think it’s due to organic matter – the organic matter breaks down during the concentration process. This is just for reference

Reply #42013-10-31

Organic matter carbonizes at high temperatures, and thus no color is left; some sources also state this

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Automatic decolorization after the concentration of wet phosphoric acid

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