Answer
See answer below.
Work Step by Step
This problem requires observation of the stoichiometric ratio between ions and the solute.
a) $0.12\ M Ba^{2+}, 0.24\ M\ Cl^{-}$
b) $0.0125\ M\ Cu^{2+}, 0.0125\ M\ SO_4^{2-}$
c) $1.00\ M\ K^+, 0.500\ M\ Cr_2O_7^{2-}$
