Aqueous Equilibrium and Precipitation Reactions- Precipitates and Complexes of Copper (II)

Precipitates and Complexes of Copper (II)

Description: Reagents are added to aqueous solutions containing hexaaqua copper (II) ion, and variously colored complex ions and precipitates are observed.

Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year: 1983  Vol: 1   Page: 318

Keywords: Complex ion, Precipitates, Copper (II), Spectrochemical series, Transition metals chemistry

Ratings:

Hazard: High

• Acute toxicity hazard – oral, dermal, inhalation
• Skin corrosion hazard
• Inhalation hazard
• Corrosive to metals
• Aquatic toxicity hazard
• Electrical shock hazard
• Physical burn hazard
• Specific organ toxicity – thyroid, respiratory systems
• Flammable liquids

Effectiveness: Good

• Clear contrast between behavior of systems
• Good connection from demo to course material
• Results are clearly observable without guidance
• Time to results is high
• Moderate reliability

Difficulty: High

• Use of toxic chemicals or reagents
• Multi-step procedures with varying results depending on order or amount of addition or reaction
• Demos requiring training or extended practice to perform correctly and safely
• Reactions that create toxic products
• Manipulations using scientific equipment

Safety Precautions:

• Eye protection required
• Gloves required
• Perform in well-ventilated area
• Absorbent materials on hand
• Sodium bicarbonate on hand
• Avoid exposure to dusts, mists, and vapors
• Thermal gloves required; tongs recommended
• Prevent release of reagents to the environment

Class: Aqueous Equilibrium and Precipitation Reactions, Transition Metals Chemistry

Division: General, Inorganic Chemistry

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