Chapter 4, Problem 30QP

Identify each of the following species as a Brø�nsted acid, base, or both: $\left(\text{a}\right)\text{ HI, }\left(\text{b}\right){\text{C}}_{\text{2}}{\text{H}}_{\text{3}}{\text{O}}_{\text{2}}^{\text{–}}\text{, }\left(\text{c}\right){\text{H}}_{\text{2}}{\text{PO}}_{\text{4}}^{\text{–}}\text{, }\left(\text{d}\right){\text{ HSO}}_{\text{4}}^{\text{–}}\text{.}$