Both ammonia (nh3) and phosphine (ph3) are soluble in water. which is least soluble and why? phosphine because it does not form hydrogen bonds with water molecules phosphine because the p-h bonds are so strong that they cannot break to enable phosphine to hydrogen-bond with water ammonia because the n-h bonds are so strong that they cannot break to enable the ammonia to hydrogen-bond with water ammonia because it does not form hydrogen bonds with water mole

            Phosphine is least soluble because it does not form hydrogen bonds with water molecules.

Explanation:

                   Hydrogen Bonding interactions are created between two molecules having a Hydrogen atom attached to most electronegative atom like Fluorine, Oxygen and Nitrogen on one molecule and the the most electronegative atom of the second molecule.

                    In given case, water contains a most electronegative atom like Oxygen, also it contains hydrogen directly attached to oxygen but in Phosphine (PH₃) there is no most electronegative atom as Phosphorous is less electronegative.

                    Hence, Phosphine fails to develop Hydrogen bonding with water molecules therefore it is less soluble than NH₃.

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