1.

An aqueous solution contains Hg^(2+),Hg_(2)^(2+),Pb^(2+),Ag^(+),Bi_(3+) and Cd^(2+).Out of these, how many ions will produce white precipitate with dilule HCl ?

Answer»


Solution :`Pb^(2+) + 2Cl^(-) to PbCl_(2) darr ("white") , Hg_(2)^(2+) + 2Cl^(-) to Hg_(2)Cl_(2) darr` (white)
`Ag^(+) + Cl^(-) to AgCl darr` (white)
`K_(sp)` of CHLORIDES of `Pb^(2+)` and `Hg_(2)^(2+)` is low as compared to `K_(sp)` of `Hg^(2+)` and `Cd^(2+)`. Chloride ion concentration provided by dilute `HCl` is just enough to EXCEED the `K_(sp)` of `PbCl_(2)` and `Hg_(2)Cl_(2)`. Thus `Pb^(2+)` and `Hg_(2)^(2+)` are PRECIPITATED as their chlorides.


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