sodium iodide and mercury(II) chloride
Play movie (21 seconds, 1.3 MB)
Adding very pale yellow sodium iodide to colorless mercury(II) chloride produces an orange precipitate.
Solution A: 0.5 M sodium iodide (very pale yellow)
Solution B: 0.1 M mercury(II) chloride (colorless)
Precipitate: (orange)
HgCl2(aq) + 2 NaI(aq) --> HgI2(s) + 2 NaCl(aq)
(2)
Molecular Representation
The mixing of solutions of mercury(II) chloride and sodium iodide results in the formation of a mixture composed of a solution of sodium choride and a mercury(II) iodide precipitate.
Slide 1: This represents a mercury(II) chloride solution. The red balls are mercury(II) ions and the green balls are chloride ions.
Slide 2: This represents a sodium iodide solution. The gray-blue balls are sodium ions and the violet balls are iodide ions
Slide 3: This represents a mixture of mercury(II) ions, chloride ions, sodium ions and iodide ions as they might appear before reaction.
Slide 4: This is a representation of the mixture present after the reaction is complete. It shows mercury(II) iodide solid, sodium ions and chloride ions.
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sodium iodide and lead(II) nitrate
Play movie (25 seconds, 1.5 MB)
Adding very pale yellow sodium iodide to colorless lead(II) nitrate produces a yellow precipitate.
Solution A: 0.5 M sodium iodide (very pale yellow)
Solution B: 0.2 M lead(II) nitrate (colorless)
Precipitate: (yellow)
Pb(NO3)2(aq) + 2 NaI(aq) --> PbI2(s) + 2 NaNO3(aq)
(2)
sodium iodide and silver nitrate
Play movie (23 seconds, 1.4 MB)
Adding very pale yellow sodium iodide to colorless silver nitrate produces a very pale tan precipitate.
Solution A: 0.5 M sodium iodide (very pale yellow)
Solution B: 0.1 M silver nitrate (colorless)
Precipitate: (off-white)
Note: a very pale tan color was observed, but not picked up by the video camera.
AgNO3(aq) + NaI(aq) --> AgI(s) + NaNO3(aq)
(2)
sodium iodide and potassium nitrate
Play movie (21 seconds, 1.3 MB)
Adding very pale yellow sodium iodide to colorless potassium nitrate results in no reaction, no precipitate and a nearly colorless solution.
Solution A: 0.5 M sodium iodide (very pale yellow)
Solution B: 0.2 M potassium nitrate (colorless)
Precipitate: none. Resulting solution: (nearly colorless)
KNO3(aq) + NaI(aq) --> No Reaction
(2)
Molecular Representation
The mixing of solutions of potassium nitrate and sodium iodide results in the formation of a solution with sodium ions, nitrate ions, potassium ions and chloride iodide ions.
Slide 1: This represents a potassium nitrate solution. The blue-green balls are potassium ions. Nitrate ions are represented by a blue ball (nitrogen) surrounded by three red balls (oxygen).
Slide 2: This represents a sodium iodide solution. The blue-grey balls are sodium ions and the violet balls are iodide ions
Slide 3: This is a representation of the mixture present after the mixing is complete. It shows potassium ions, iodide ions, sodium ions and nitrate ions.
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© 1997 Division of Chemical Education, Inc., American Chemical Society. All rights reserved.