During salt analysis of basic radical. When we try to find group 1 analysis( for e.g. pb) we put hcl to make precipitate . And in group 3 analysis we use the concept of common ion effect. But if in group 1 analysis if we have to find the presence of pb2+ ion in salt pbcl2 then what is the use of hcl. Explain it in 30 -40 words.
