(unlike Cu(II) and Ag(I)) or acetic acid (unlike Cu(II) and Hg(II)).

This group can be determined by adding the salt in water and then adding dilute hydrochloric acid. A white precipitate is formed, to which ammonia is then added. If the precipitate is insoluble, then Pb²⁺ is present; if the precipitate is soluble, then Ag⁺ is present, and if the white precipitate turns black, then Hg is present.

Hg ions, after oxidation in the presence of chloride ions to HgCl₄^2-,

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