Equilibrium- Temperature-Dependent Equilibrium with Cobalt in Isopropanol

Chloro Complexes of Cobalt (II)

Chromate-Dichromate Equilibrium

Equilibrium Between Nitrogen Dioxide and Dinitrogen Tetroxide

Partitioning of Iodine in Solution

Esterification Using a Dean-Stark Trap

Iron (III) Thiocyanate Complex Ion Equilibrium

Temperature-Dependent Equilibrium with Cobalt in Isopropanol

Acid and Ammonium Hydroxide Solubility Effect

Slow Formation of a Chloro Complex of Chromium (III) Ion

Temperature-Dependent Equilibrium with Cobalt in Isopropanol

Description Two mixtures of isopropanol and 0.2 M cobalt chloride are mixed in a 50:50 v/V ratio. The mixture is heated until the color of the liquid changes to a deep blue. It is then cooled and returns to a pale red color. A second tube is heated until the blue color appears, and then silver nitrate is added. The chloride in the mixture precipitates, and the pale red color will return.

Source: Maynard, James

Year: 2019   Vol: N/A   Page: N/A

Keywords: Equilibrium, Complexation, Cobalt, Temperature

Rating:

Hazard: Some

• Use of mildly toxic reagents
• Chemicals that may be sensitive to the environments
• Corrosive to metals
• Serious eye damage
• Eye irritation
• Specific target organ toxicity- single exposure- CNS
• Acute toxicity hazard- oral
• Respiratory sensitization
• Skin sensitization
• Skin corrosion hazard
• Germ cell mutagenicity
• Carcinogenicity
• Reproductive toxicity hazard
• Short-term (acute) aquatic toxicity
• Long-term (chronic) aquatic toxicity hazard
• Use of hot plate or open flame

Effectiveness: Good

• Results are observable without guidance
• Good connection from demo to course material
• Mild are observed by audience
• Time to results is medium

Difficulty: Low

• Simple manipulations for most to perform
• Demo do not involve deep attention
• Simple procedures

Safety Precautions:

• Eye protection required
• Gloves required
• Hot gloves required
• Lab coat recommended
• Tongs recommended
• Avoid exposure to dusts, mists, vapors
• Perform in a well-ventilated area
• Use UL approved three-prong plug and outlet
• Avoid release of reagents to the environment

Class: Equilibrium

Division: General Chemistry

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