The conjugate bases for $HCO_3^-$ and $NH_3$,respectively,are

What is meant by the conjugate acid-base pair? Find the conjugate acid/base for the following species:
$HNO_{2}$,$CN^{-}$,$HClO_{4}$,$F^{-}$,$OH^{-}$,$CO_{3}^{2-}$,and $S^{2-}$

When ammonia is added to water,which of the following ions is responsible for the increase in its basicity (or decrease in $H_3O^+$ concentration)?

Conjugate acid of $NH_2^{-}$ and $NH_3$ are respectively

Which of the following compounds accepts a proton from a water molecule according to the Bronsted-Lowry theory?

The conjugate acid of $NH_2^-$ is