Question

Why pb²+ come in both first and second group ?

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Answer 1

Answer:

Simply because lead(II) fits both analytical groups:

• it forms lead(II) chloride PbCl2, a poor soluble chloride, which puts it in the 1st group;

• it also forms lead(II) sulfide PbS, insoluble in water and diluted acids, which also puts it in the 2nd group.

One reason for putting lead in both groups is that the chloride is somewhat of a borderline case in terms of being insoluble enough to appear in Group I. Group II represents a more complicated analysis but is more sensitive for lead.

Answer 2

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Why pb²+ come in both first and second group ?

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❥One reason for putting lead in both groups is that the chloride is somewhat of a borderline case in terms of being insoluble enough to appear in Group I. Group II represents a more complicated analysis but is more sensitive for lead