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 d

Question

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 d

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 ?

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - 3
`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 to exceed the `K_(sp)` of `PbCl_2` and `Hg_2Cl_2` Thus `Pb^(2+)` and `Hg_2^(2+)` are precipitated as their chlorides