PPT Slide

Precipitation and Separation of Ions

• As H2S is added to the green solution, black CuS forms in a colorless solution of Zn2+(aq).

• When more H2S is added, a second precipitate of white ZnS forms.

Selective Precipitation of Ions

• Ions can be separated from each other based on their salt solubilities.

• Example: if HCl is added to a solution containing Ag+ and Cu2+, the silver precipitates (Ksp for AgCl is 1.8 _ 10-10) while the Cu2+ remains in solution.

• Removal of one metal ion from a solution is called selective precipitation.

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