Question

Why lower aliphatic amines are soluble in water while higher amines are not?

Answer 1

smaller amines are soluble in water but as the hydrophobic part of the amine become larger than six carbons,their solubility in water decreases and still larger amines are essentially insoluble in water.

Answer 2

Answer:

✔Lower aliphatic amines are soluble in water because they can form hydrogen bonds with water molecules.

✔Solubility decreases with increase in molar mass of amines due to increase in size of the hydrophobic alkyl part. Therefore, higher amines are insoluble in water.

✔The higher amines are more soluble in less polar solvents such as ethers, alcohols and benzene.

✔Aromatic amines are insoluble in water but soluble in ether, alcohol and benzene.