this is due to the difference in electron density. Butylamine has more electron density than ammonia. Due to this reason is a Butylamine stronger base than ammonia. BUtylamine has positive induction effect of -CH3 group electron density on N atom which increases
Kb of butylamine is higher than the Kb of ammonia.
Explanation:
Hello,
In this case, we can cite the methylamine and ethylamine Kb values as 4.38e-4 and 5.6e-4 respectively. On the other hand, ammonia has a Kb of 1.8e-5. Kb is important because it is a measure of how dissociated a base is; now as it is seen, Kb of ammonia is smaller than Kb of both methylamine and ethylamine, it means that the amine are more likely to dissociate, so they are stronger. Nevertheless, since the Kb are given for the aforesaid amines, one expects the Kb of butylamine to be higher than those. Thus, butylamine is stronger than ammonia in terms of dissociation.
