Transition Metals- Lability of Ligands Iron(III) vs Chromium(III) Nitrates
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
- 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
- Use of scientific equipment
- Simple procedures
- Simple manipulations for most to perform
- Use of toxic reagents
- Reactions or demos at non-standard conditions
- 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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