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Which of the following complexes will produce a white precipitate with aqueous AgNO3?

1. [Co(NH3)5Cl](NO2)2
2. [Pt(NH3)6]Cl4
3. [Pt(en)Cl2]
4. [Cu(NH3)4]SO4

Correct answer: [Pt(NH3)6]Cl4

Solution

A white precipitate (AgCl) forms only from chloride present as a counter-ion. In [Pt(NH3)6]Cl4 all four Cl- are ionizable and precipitate as AgCl; in the others Cl is coordinated (or there is no Cl), so no white precipitate.

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