Question

Devise a procedure for selectively precipitating the following ions from each other in a common solution. Record your table, the order the solutions must be added and the precipitate that forms at each step. (4 each)

a. Cl- and PO4 3-

b. Ca2+ and Ag+

c. Cu2+ and Ca2+

Answer 1

a. add Ba(OH)₂ to ppt PO₄^3- . BaPO₄ will precipitate

b. add cloride to ppt Ag⁺. AgCl₂ will precipitate

c. add Na₂SO₄ to ppt Ca²⁺. CaSO₄ will precipitate