Chloro Complexes of Cobalt (II)
Chromate – Dichromate Equilibrium
Oxidation of Chloride Ion by Permanganate
Precipitates and Complexes of Iron (III)
Precipitates and Complexes of Nickel (II)
Bromo Complexes of Copper (II)
Precipitates and Complexes of Copper (II)
Precipitates and Complexes of Silver (I)
Ignition of Hydrogen on a Platinum Catalyst
Geiger Counter and Alpha, Beta, and Gamma Sources
Extraction of Copper Ions from Solution With Orform®
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
Return to Inorganic Chemistry Demonstrations