To write a procedure you really need to know the solubility tables. You can go to Google to find that table. Then you should memorize it. Here is a procedure that will work.
To the sample, add a few drops of AgNO3. No ppt means Ba ion is present. A white ppt means either Pb ion or Ag ion (or both) are present as AgCl or PbCl2. Let the ppt settle and decant the liquid. Divide the ppt into two parts. To one part add hot water. If the white ppt dissolves it is Pb^2+ because PbCl2 is soluble in hot water. To the other part add dilute aqueous NH3. If it dissolves it is Ag^+ because AgCl in the presence of NH3 form a complex ion of [Ag(NH3)2]^+ which is soluble. That, in summary, is the procedure for group I of an analytical procedure for qualitative analysis of an unknown. If you take much chemistry you should become familiar with that.
You are given a solution that contains one of the ions Ag+, Pb2+ or Ba2+. Develop a procedure to determine which ion is present. More than one reaction may be required to discover the ion’s identity. Explain how your procedure will determine the identity of the ion.
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