Chapter 3, Problem 59P

Write the formula for the ionic compound formed from the barium cation ${\text{(Ba}}^{\text{2}}{}^{+})$ and each anion:

(a) ${\text{CN}}^{\text{-}};$ (b) ${\text{PO}}_{\text{4}}{{}^{\text{2}}}^{\text{-}};$ (c) ${\text{HPO}}_{\text{4}}{{}^{\text{2}}}^{\text{-}};$ (d) ${\text{H}}_{\text{2}}{\text{PO}}_{\text{4}}{}^{\text{-}}.$