Question

why is ammonia more basic than tertiary amine

Answer 1

because ammonia has a higher concentration of OH- ions than tertiary amine

Answer 2

Because alkyl groups donate electrons to the more electronegative nitrogen. The inductive effect makes the electron density on the alkylamine's nitrogen greater than the nitrogen of ammonium. Correspondingly, primary, secondary, and tertiary alkyl amines are more basic than ammonia.
mark as brainiest.
hope it helps