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PH3 forms bubbles when passed slowly in water but NH3 dissolves. Explain why?

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NH3 forms hydrogen bonds with water therefore it is soluble in it but PH3 cannot form hydrogen bond with water so it escapes as gas.

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PH3 forms bubbles means that it's not soluble in water and NH3 completely dissolves because it's soluble in water.

Now NH3 can form hydrogen bonds with water i.e H20 and hence it's completely soluble in water while PH3 can't form hydrogen bonds with water because of large size of phosphorus as compared to Nitrogen.

This picture shows hydrogen bonding between Ammonia and water.

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