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 ?
Text Solution
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3 (Hg 2 2+ , Pb 2+ , Ag + )
Sol. Pb 2+ + 2Cl – 
PbCl 2 ↓ (white) ; Hg 2 2+ + 2Cl – 
Hg 2 Cl 2 ↓ (white)
Ag + + Cl – 
AgCl ↓ (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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