Transition Metals- Oxidation States of Vanadium (II) with Permanganate

Chloro Complexes of Cobalt (II)

Chromate – Dichromate Equilibrium

Oxidation of Chloride Ion by Permanganate

Oxidation States of Vanadium

Precipitates and Complexes of Iron (II)

Precipitates and Complexes of Nickel (II)

Bromo Complexes of Copper (II)

Hydration of Cu (II)

Precipitates and Complexes of Copper (II)

Precipitates and Complexes of Silver (I)

Formation of a Silver Mirror

Ignition of Hydrogen on a Platinum Catalyst

Geiger Counter and Alpha, Beta, Gamma Sources

Extraction of Copper Ions from Solution with Orform®

Preparation and Properties of Zirconium

Samples of Minerals

Lability of Ligands Iron(III) vs Chromium(III) Nitrates

Oxidation States of Vanadium (II) with Permanganate

Oxidation States Of Vanadium (II) with Permanganate

Synopsis: Ammonium Metavanadate is dissolved in aqueous solution, as which it has a characteristic clear yellow color in solution. The solution is treated with a Jones Reductor, which changes the color for each corresponding to the oxidation state of the Vanadium complex. The colors changes from yellow to blue, the dark green, and finally, purple. The reduced mixture is then titrated back to a +5 oxidation state using a 0.02M potassium Permanganate solution. 

5V⁺²(aq) + 3KMnO₄(aq) + 3H₂O(l) → 5VO₃⁻(aq) + 3Mn⁺²(aq) + 3K⁺(aq) + 5NH₄⁺(aq) + H⁺(aq) 

Source: UW Card Catalog

Year: N/A    Vol:  N/A  Page: N/A

Keywords: Oxidation state, Reduction, Vanadium, Titration, Permanganate. 

Rating:

Hazard: Medium

• Acute toxicity- oral, inhalation, dermal
• Eye irritation
• Specific target organ toxicity- repeated exposure – inhalation, respiratory tract
• Short-term (acute) aquatic hazard
• Long-term (chronic) aquatic hazard
• Corrosive to metals
• Skin corrosion hazard
• Serious eye damage
• Flammability of dusts
• Oxidizing solids
• Oxidizing liquids
• Scalding hazard
• Electric shock hazard

Effectiveness: Average

• Some connection from demo to course material
• Mild effects are observed by audience
• Results are observable with guidance
• Time to results is medium
• Moderate failure rate

Difficulty: Medium

• Use of scientific equipment
• Some careful manipulation required
• Volume dependent addition of reagents for proper results
• Procedures with some intermediate steps to results

Safety Precautions:

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

Class: Transition Metals

Division: General, Inorganic Chemistry

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