The "group 1" cations are those that form insoluble chloride salts. For this experiment, we will limits the discussion to Ag+, Pb2+, and Hg22+. This experiment is described at https://chem.libretexts.org/Bookshelves/Ancillary_Materials/Laboratory_Experiments/Wet_Lab_Experiments/General_Chemistry_Labs/Online_Chemistry_Lab_Manual/Chem_12_Experiments/06%3A_Qualitative_Analysis_of_Group_I_Ions_(Experiment)