explain me, basic strength of elephatic amine in polar solvent or non-gaseous phase

Aliphatic amines basic strength in aqueous medium is in the order
(CH3)2NH > >CH3NH2 > (CH3)3N >NH3(CH3CH2)2NH > (CH3CH2)3N >CH3CH2NH2 >  NH3


This is due to the fact that the basic strength of an amine in water is determined not only by electron - availability on the nitrogen atom, but also by the extent to which the cation, formed by uptake of a proton, can undergo solvation, and so become stabilised. The more hydrogen atoms attached to nitrogen in the cation, the greater the possibilities of powerful solvation via hydrogen bonding between these and water

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