Reaction of Calcium Oxide and Water
Description: Add water to calcium oxide (quicklime) and observe the temperature rise with digital thermometer and evolution of steam.
Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry
Year: 1983 Vol: 1 Page: 19
Keywords: Calcium oxide, Exothermic, Slaking, Digital thermometer, Lime
Rating: 
Hazard: Medium
- Skin corrosion hazard
- Inhalation hazard
- Burn hazard
- Short term aquatic toxicity hazard
- Serious eye damage hazard
- Electric shock hazard
Effectiveness: Average
- Secondary observations
- Moderate failure rate
- Mild effects are seen by audience
- Some connections from demo to course material
- Time to results is low
- Results are difficult to perceive
Difficulty: Medium
- Simple procedures
- Simple manipulations for most to perform
- Demos in which remote display is needed
- Exposure to hazardous reagents
- Demos at non-standard conditions
Safety Precautions:
- Eye protection required
- Gloves required
- Thermal gloves recommended
- Perform in a well-ventilated area
- Avoid exposure to dust, mists, or vapor
- Use of UL approved three-prong plug and outlet
- Perform on a chemically resistant surface
Class: Thermochemistry
Division: General
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