# The conjugate base of an acid remains after the acid has donated what?

May 21, 2017

proton

#### Explanation:

According to the Bronsted-Lowry proton transfer rule 'an acid will transfer it's acidic proton to the conjugate base of a weaker acid'.

$H A + {B}^{-} \implies H B + {A}^{-}$
HB is a weaker acid than HA. ${B}^{-}$ is the conjugate base of HB and ${A}^{-}$ is the conjugate base of HA.

When comparing acidities, the weaker acid will have the smaller acid ionization constant ${K}_{a}$ and its anion base is the stronger conjugate base which bonds more strongly with the transferred proton.