Predicting Acidity of PH3: Comparison to NH3 Dipole Moments

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Homework Statement


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.

Homework Equations

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?
 
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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?