Colorless sodium sulfide solution is added to green nickel(II) nitrate solution.
Approximately 2 mL of Solution A (on the left) is added to a sample of Solution B (on the right) with a dropping pipet. If a precipitate forms, the resulting precipitate is suspended in the mixture. The mixture is then stirred with a glass stirring rod and the precipitate is allowed to settle for about a minute.
Solution A: 0.1 M sodium sulfide, colorless
Solution B: 0.2 M nickel(II) nitrate, green
Precipitate: black
Ni(NO3)2(aq) + Na2S(aq) —> NiS(s) + 2 NaNO3(aq)
Credits:
- Design
- Kenneth R. Magnell Central Michigan University, Mt. Pleasant, MI 48859
- John W. Moore University of Wisconsin - Madison, Madison, WI 53706
- Video
- Jerrold J. Jacobsen University of Wisconsin - Madison, Madison, WI 53706
- Text
- Kenneth R. Magnell Central Michigan University, Mt. Pleasant, MI 48859