Transition Metals and Coordination Compounds- Precipitates and Complexes of Nickel (II)

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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