1.

PbCl_2 is insoluble in cold water. Addition of HCl increases its solubility due to

Answer»

FORMATION of soluble complex ANIONS like `[PbCl_3]^(-)`
oxidation of `Pb(II) ` to `Pb(IV)`
formation of `[Pb(H_2O)_(6)]^(2+)`
formation of polymeric lead COMPLEXES.

SOLUTION :Addition of chloride ions to a suspension of `PbCl_2` gives rise to soluble complex ions as shown :
`PbCl_(2(s)) + Cl^(-) to [PbCl_(3)]_((aq))^(-)`
`PbCl_(2(s)) + 2Cl^(-) to [PbCl_(4)]_((aq))^(2-)`


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