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Homework Help: Predict acidity of PH3

  1. Aug 5, 2015 #1
    1. The problem statement, all variables and given/known data
    Aluminum phosphide is hydrolysed by water to generate the highly toxic gas phosphine. NH3 is a polar molecule with a dipole moment of 1.47D while PH3 has a dipole moment of 0.58D. Predict whether PH3 is acidic neutral or basic.

    2. Relevant equations

    3. The attempt at a solution
    If NH3 has a higher dipole moment than PH3 and is basic does it mean PH3 is acidic? How does polarity affect the acidity of a molecule?
  2. jcsd
  3. Aug 10, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
  4. Aug 17, 2015 #3

    Suraj M

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    Gold Member

    PH₃ on its own is basic, i hope you Know that..So i don't understand how you could say it's acidic. It definitely not. But relative to NH₃, you could say its acidic, though its not.
    other than that, could you relate dipole moment( the EN of the central atom) with the bond strength?
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