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Questions
PH3 forms bubbles when passed slowly in water but NH3 dissolves. Explain why?
On being slowly passed through water, PH3 forms bubbles but NH3 dissolves. Why is it so?
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Solution 1
In PCl5, phosphorus undergoes sp3d hybridisation, and a trigonal bipyramidal configuration comes into existence.
The equatorial P-Cl bonds are equivalent, while two axial bonds are different and larger than equatorial bonds.
Solution 2
- Ammonia (NH3) dissolves in water because it can form hydrogen bonds with water molecules due to the presence of a lone pair on nitrogen and N-H bonds.
- Phosphine (PH3) forms bubbles when passed through water because it cannot form hydrogen bonds with water; its bonds are weaker and mainly van der Waals forces.
- Hence, NH3 is highly soluble in water, while PH3 remains largely insoluble and escapes as bubbles.
This difference arises from the ability of NH3 to hydrogen bond, but PH3 cannot.
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