I'm taking Chem II over the summer at a junior college and was given this problem on one of my homework assignments: I am told I have a sol'n containing the cations Ag, Al, As, Ba, Bi, Ca, Cd, Co, Cr, Cu, and Fe. My objective is to write all the compounds that would be precipitated if hydrochloric acid is added to the above sol'n. My instincts are telling me to just use the solubility rules. For example, when Ag and hydrochloric acid combine, AgCl is formed but according to the solubility rules AgCl is insoluble so AgCl would be one of the compounds that would be precipitated. Am I going about this all wrong or what? Thanks alot!