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H3PO4 to H3PO3

  1. Jan 6, 2010 #1

    Char. Limit

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    Is there any method, using common laboratory materials, to change phosphoric acid (H3PO4) to phosphorous acid (H3PO3)?

    Assume that P4O6 is not available for purchase, but methods to make it are welcome.

    This is for a culminating project, so not really homework, but I don't know where else to turn. Even my chemistry teacher doesn't know.
     
  2. jcsd
  3. Jan 8, 2010 #2

    Char. Limit

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    Just another question:

    If H3PO3 is a "reducing agent" and H3PO4 is a by-product of the reduction, can an opposite reaction be carried out to yield H3PO3?
     
  4. Jan 10, 2010 #3

    Char. Limit

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    Does no one om this illustrious forum know?
     
  5. Jan 11, 2010 #4

    MATLABdude

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    You can probably set up an electrochemical cell (using an appropriate oxidation half reaction) to convert the phosphate to phosphite:
    http://en.wikipedia.org/wiki/Standard_electrode_potential_(data_page [Broken])

    (It's about half-way down, search for po4)

    EDIT: Or maybe drive the reaction using an electrolytic one.
     
    Last edited by a moderator: May 4, 2017
  6. Jan 11, 2010 #5

    Char. Limit

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    Excellent...

    How should I do that, or should I ask my chemistry teacher?

    2,718,282 thanks to you.
     
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