Add an additional drop or two of HCl and let the solution sit, to see if more AgCl or PbCl 2 precipitate forms. If so, remove by centrifugation. To make the most efficient use of time, you should begin the separation of Group II ions, in section 2 at this point. I ions and perform the confirmation tests for lead and silver. Careful labeling and notebook records will help you to keep track of your test tubes.
Lead chloride is almost three times more soluble in hot water than cold.
One may use this as a basis for separating it from silver chloride. The presence of lead is then confirmed by precipitation of yellow lead chromate. Centrifuge while hot, decant, and save both the solution and the solid. Add 2-3 drops of 1 M K 2 CrO 4 to the solution. Silver forms a soluble complex ion with aqueous ammonia.