1.

An aqueous solution contains Hg^(2+), Hg_2^(2+),Pb^(2+),Ag^(+),Bl^(3+) and Cd^(2+).Out of these, how many ions will produce white precipitate with dilute HCl ?

Answer»


Solution :`Pb^(2+)+2Cl^(-)toPbCl_2darr(white), Hg_2^(2+)+2Cl^(-)toHg_2Cl_2darr`(white)
`Ag^(+)+Cl^(-)toAgCldarr`(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 H Cl is just enough toexceed the `K_(sp)` of `PbCl_2` and `Hg_2Cl_2` Thus `Pb^(2+)` and `Hg_2^(2+)` are precipitated as their chlorides


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