Transition Metals- Lability of Ligands Iron(III) vs Chromium(III) Nitrates

Chloro Complexes of Cobalt (II)

Chromate – Dichromate Equilibrium

Oxidation of Chloride Ion by Permanganate

Oxidation States of Vanadium

Precipitates and Complexes of Iron (III)

Precipitates and Complexes of Nickel (II)

Bromo Complexes of Copper (II)

Hydration of Cu (II) Ion

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, and Gamma Sources

Extraction of Copper Ions from Solution With Orform®

Preparation and Properties of Zirconium

Samples of Minerals

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

Oxidation States of Vanadium (II) with Permanganate

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

Description: Two .10 M solutions of iron (III) nitrate and chromium (III) nitrate are treated with ~ 15 mL of saturated sodium chloride. The pale iron (III) nitrate changes color to the yellow iron (III) chloride upon addition of chloride ions and the chromium does not. Heating the chromium (III) nitrate with chloride for several minutes will change the purple chromium nitrate to a deep green.

Fe(NO₃)₃(aq) +3 NaCl(sat) → FeCl₃(aq) + 3NaNO₃(aq) (fast) -pale purple to yellow

Cr(NO₃)₃(aq) + 3 NaCl(sat) + Δ →CrCl₃(aq) + 3NaNO₃(aq) (slow)- deep purple to deep green

Source: Moore, J.W.,  Burstyn, J., Maynard J.H.

Year:   2014    Vol: N/A    Page: N/A

Keywords: Ligand, Coordination, Inner Sphere, Lability

Rating:

Hazard: Some

• Skin corrosion hazard
• Serious eye damage
• Oxidizing solids
• Skin irritation
• Eye irritation
• Skin sensitization
• Short-term (acute) aquatic hazard
• Long-term (chronic) aquatic hazard
• Corrosive to metals
• Acute toxicity hazard- oral
• Burn hazard
• Scald hazard

Effectiveness: Average

• Time to results is medium
• Good connection from demo to course material
• Results are observable with guidance
• Mild effects are observed by audience
• Contrast of behaviors systems is noticeable
• Good reliability

Difficulty: Medium

• Use of scientific equipment
• Simple procedures
• Simple manipulations for most to perform
• Use of toxic reagents
• Reactions or demos at non-standard conditions

Safety Precautions:

• Eye protection required
• Gloves required
• Thermal gloves recommended
• Avoid exposure to dusts, mists, and droplets
• Use UL-approved three-prong plug and outlet
• Prevent release of reagents to the environment
• Prepare in a well-ventilated area
• Perform on a thermally and chemically resistant surface

Class: Transition Metals

Division: Inorganic Chemistry

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