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Concentrated HCl cannot be used as group...

Concentrated HCl cannot be used as group reagent in first group precipitation. Why ?

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The conc. HCl is avoided because ions in high concentration increases the solubility of precipitate of group I chlorides through the formation of soluble complex ions
`AgCl+2Cl^(-) rarr AgCl_(3)^(2-)`
`PbCl_(2)+2Cl^(-) rarr PbCl_(4)^(2-)`
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