## Chemistry: The Central Science (13th Edition)

Acids: $HCOOH$ and $HP{O_4}^{2-}$ Bases: ${PO_4}^{3-}$ and $HCOO^-$
$HCOOH$ and $HP{O_4}^{2-}$ are acids because they give one proton $H^+$ in the reaction. ${PO_4}^{3-}$ and $HCOO^-$ are bases because they receive these protons.