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 dilute HCl.

Answer»


Solution :`Pb^(2+)+2Cl^(-) to PbCl_(2) darr`(WHITE)
`Hg_(2)^(2+)+2Cl^(-) to Hg_(2)Cl_(2)darr`(white)
`Ag^(+) to 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.


Discussion

No Comment Found

Related InterviewSolutions