Using Large Glass Cylinders to Demonstrate Precipitation Reactions
Description: A precipitate is formed from two soluble salts in a large glass cylinder that is almost completely filled with one of the salt solutions. The other salt is dissolved in a funnel at the top of the cylinder. When the solutions meet at the funnel stem, a precipitate forms. This process can continue for almost an hour.
Source: Journal of Chemical Education
Year: 1999 Vol. 76 Page 528
Keywords: Precipitate, Salt, Funnel, Large
Rating: 
Hazard: Some
- Acute toxicity hazard – oral, inhalation
- Aquatic toxicity hazard
- Carcinogenicity hazard
- Corrosive to metals
- Reproductive toxicity hazard
- Serious eye damage
Effectiveness: Average
- Results are observable without guidance
- Good connection from demo to course material
- Time to results is medium
- Good reliability
- Mild effects are seen by audience
Difficulty: Low
- Simple manipulations for most to perform
- Simple procedures
- Use of large glassware
Safety Precautions:
- Eye protection required
- Gloves required
- Absorbent materials on hand
- Avoid exposure to mists, droplets or solids
Class: Precipitation Reactions
Division: General
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