A Simple, Vivid Demonstration of Selective Precipitation
Description: Beakers containing sodium carbonate, potassium iodide and a mixture of the two are treated with lead (II) nitrate. The precipitation of lead iodide and lead carbonate are noted based on the ratio of reactants added and the solubility products of the two possible product species.
Source: UW Madison Chemistry Card Catalog
Year: N/A Vol: N/A Page: N/A
Keywords: Selective precipitation, Solubility, Lead, Solubility product
Rating: 
Hazards: Medium
- Eye irritation
- Serious eye damage
- Specific organ toxicity- oral, thyroid, CNS. blood, immune system, kidney disease
- Carcinogenicity
- Reproductive toxicity
- Short term (acute) aquatic toxicity
- Long term (chronic) aquatic toxicity
- Electric shock hazard
- Oxidizing solids
Effectiveness: Average
- Results are observable with guidance
- Mild effects are observed by audience
- Time to results is medium
- Good reliability
Difficulty: Medium
- Some concerted or timed manipulations
- Procedures with some intermediate steps to result
- Use of toxic substances
Safety Precautions:
- Eye protection required
- Gloves required
- Lab coat recommended
- Use UL approved three-prong plug and outlet
- Avoid exposures to mists, dusts, and vapors
- Fume hood required
- Prevent release of reagents to the environment
- Perform in a well-ventilated hood
Class: Solubility, Equilibrium
Division: Inorganic, General Chemistry
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