Buffers — Definition & Overview

H$^+$ is the weak acid. HCO$_3$$^-$ is the conjugate base.

H$_2$CO$_3$ is the weak acid. HCO$_3$$^-$ is the conjugate base.

HCO$_3$$^-$ is the weak acid. H$^+$ is the conjugate base.

H$^+$ is the weak acid. H$_2$CO$_3$ is the conjugate base.