Precipitates and Complexes of Nickel (II)
Description: Colored precipitates and complex ions of nickel (II) are formed by adding various ligands to the initial green solution.
Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry
Year: 1983 Vol: 1 Page: 299
Keywords: Complex ions, Ligands, Nickel (II), Ethylenediamine, Octahedral, Tetrahedral
Ratings: 
Hazard: High
- Acute toxicity hazard – oral, inhalation, dermal
- Specific organ toxicity – thyroid
- Skin corrosion hazard
- Skin sensitization
- Respiratory sensitization
- Serious eye damage
- Corrosive to metals
- Germ cell mutagenicity hazard
- Carcinogenicity hazard
- Reproductive toxicity
- Aquatic toxicity
- Flammable liquids and solids hazard
Effectiveness: Excellent
- Results are deeply engaging to audience
- Profound connection to course material
- Superior reliability
- Contrast between system is obvious
- Time to results is low
Difficulty: Medium
- Adding reagents in specific volumes and in order
- Procedures with some intermediate steps to results
- Simple manipulations
- Handling of highly toxic reagents
Safety Precautions:
- Eye protection required
- Gloves required
- Absorbent materials on hand
- Spill kit on hand
- Perform in a well-ventilated area
- Treat nickel sample for cyanide addition with base prior to use
- Avoid exposure to mists droplets or vapors
- ABC fire extinguisher on hand
- Prevent release of reagents to the environment
Class: Aqueous Equilibrium and Precipitation Reactions, Transition Metals Chemistry, Coordination Compounds
Division: General, Inorganic Chemistry
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