Cadmium Sulfide Precipitates as a Function of H+ Concentration
Description: A solution of cadmium chloride is divided in three parts, and different quantities of acids are added to the second and third aliquots. Equal amounts of sulfide ions are added to all three aliquots. The least acidic solution yields the most CdS precipitate.
Source: UW Card Catalog
Year: N/A Vol: N/A Page: N/A
Keywords: Hydrochloric Acid, Sulfide, Equilibrium, Cadmium, pH, Precipitation
Rating: 
Hazard: High
- Acute toxicity – oral, inhalation, dermal
- Skin corrosion hazard
- Reproductive toxicity hazard
- Carcinogenicity hazard
- Germ cell mutagenicity hazard
- Aquatic toxicity hazard
- Corrosive to metals
- Specific organ toxicity – respiratory system
Effectiveness: Average
- Mild effects are seen by audience
- Somewhat conceptually connected to course material
- Time to results is medium
- System contrast is noticeable with guidance
Difficulty: Medium
- Adding reagents in concert
- Volume-dependent addition for proper results
- Use of highly toxic compounds
- Procedures with some intermediate steps to results
- Simple manipulations for most to perform
Safety Precautions:
- Gloves required
- Eye protection required
- Perform in a well-ventilated area
- Absorbent materials on hand
- Sodium bicarbonate on hand
- Avoid exposure to mists vapors or gases
- Prevent release of reagents to the environment
Class: Aqueous Equilibrium and Precipitation Reactions, Acids and Bases
Division: General
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