Chapter 17, Problem 67QP

Which of the following will be more soluble in acid solution than in pure water: $\left(\text{a}\right)\text{ Cul, }\left(\text{b}\right){\text{ Ag}}_{\text{2}}{\text{SO}}_{\text{4}}\text{, }\left(\text{c}\right)\text{ Zn}{\left(\text{OH}\right)}_{\text{2}}\text{, }\left(\text{d}\right){\text{ BaC}}_{\text{2}}{\text{O}}_{\text{4}}\text{, }\left(\text{e}\right){\text{ Ca}}_{\text{3}}{\left({\text{PO}}_{\text{4}}\right)}_{\text{2}}\text{?}$