Limiting Reagent – Reaction of Magnesium and HCl
Description: Equal qualities of magnesium are reacted with unequal quantities of acid. In one, Mg is quickly completely dissolved. In a second, most Mg remains. In a third, Mg barely reacts with the HCl. This is displayed on an overhead projector.
Source: UW Card Catalog
Year: N/A Vol: N/A Page: N/A
Keywords: Magnesium, HCl, Limiting, Projector
Rating: 
Hazard: Some
- Production of flammable gases
- Use of pyrophoric metal
- Flammability hazard
- Skin corrosion hazard
- Inhalation hazard
- Electric shock hazard
Effectiveness: Average
- Results are observable with guidance
- Good connection from demo to course material
- Mild effects are seen by audience
- Reliability is moderate
- Time to results is medium
Difficulty: Some
- Some sequential manipulations
- Some intermediate steps to results
- Simple manipulations for most to perform
- Concentration-dependent additions
Safety Precautions:
- Gloves required
- Eye protection required
- Absorbent materials recommended
- Use of UL approved three-prong plug and outlet
- Perform in a well-ventilated area
- Sand or Class D fire extinguisher on hand
- Avoid exposure to mist or vapors
Class: Gas Production Reaction
Division: General
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