Chapter 4.2, Problem 1CP

Which of the following are water-soluble? (Choose all that apply.)

$\begin{array}{l}\text{a)}\hfill \\ {\text{Na}}_{\text{2}}\text{S}\hfill \\ \text{b)}\hfill \\ \text{Ba}{\left({\text{C}}_{\text{2}}{\text{H}}_{\text{3}}{\text{O}}_{\text{2}}\right)}_{\text{2}}\hfill \\ \text{c)}\hfill \\ {\text{CaCO}}_{\text{3}}\hfill \\ \text{d)}\hfill \\ {\text{CuBr}}_{\text{2}}\hfill \\ \text{e)}\hfill \\ {\text{Hg}}_{\text{2}}{\text{Cl}}_{\text{2}}\hfill \end{array}$