Demonstration of Chemical Inhibition
Description: Three beakers containing water, sulfuric acid, potassium iodide and a metal salt. The three salts impart differing reactivity and color changes to the three systems upon the addition of hydrogen peroxide.
Source: UW Card catalog
Year: N/A Vol: N/A Page: N/A
Rating: 
Keywords: Chemical Inhibition, Copper, Manganese, Acid
Hazard: Some
- Corrosive to metals
- Skin corrosion hazard
- Serious eye damage
- Oxidizing solids
- Skin irritation
- Eye irritation
- Specific target organ toxicity – single exposure – respiratory system
- Specific target organ toxicity – repeated exposure – inhalation, brain
- Short-term (acute) aquatic toxicity
- Long-term (chronic) aquatic toxicity
- Acute toxicity – oral
Effectiveness: Good
- Results are clearly observable without guidance
- Contrast between systems behavior is clear
- Some connection from demo to course material
- Time to results is low
- Good reliability
- Mild effects are observed by audience
Difficulty: Medium
- Adding reagents sequentially
- Simple manipulations
- Procedures with some intermediate steps to results
- Use of mildly reactive substances
Safety Precautions:
- Eye protection required
- Gloves required
- Lab coat recommended
- Avoid exposure to dusts, mists, and vapors
- Prepare in a well-ventilated area
- Use UL approved three-prong plug and outlet
- Avoid release of reagents to the environment
Class: Catalysis, Kinetics
Division: General
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