7778-50-9

Appearance: Bright red-orange crystalline solid.
Odor: Odorless.
Density: 2.676 g/cm³.
Melting Point: 398°C.
Boiling Point: 500°C (decomposes).
Solubility in Water:
- 4.9 g/100 mL at 0°C.
- 13 g/100 mL at 20°C.
- 102 g/100 mL at 100°C.
Solubility in Other Solvents: Insoluble in alcohol and acetone.

Oxidizing Agent: Potassium dichromate is a strong oxidizing agent used in various chemical reactions.
Color Change:
- In acidic conditions, it appears orange-red (Cr₂O₇²⁻).
- In alkaline conditions, it turns yellow (CrO₄²⁻).
Thermal Decomposition:
- Decomposes at high temperatures to form potassium chromate, chromium(III) oxide, and oxygen.
- Reaction: 4K₂Cr₂O₇ → 4K₂CrO₄ + 2Cr₂O₃ + 3O₂.

Analytical Chemistry: Used as a reagent for detecting ferrous salts, iodides, and sulfides.
Leather Tanning: Used as a precursor for potassium chrome alum.
Photography: Used in photographic screen printing.
Glass Cleaning: Historically used as a cleaning agent for glassware (though discontinued due to safety concerns).
Medical Uses: Used externally as an antiseptic, caustic, and astringent.

Health Hazards:
- Potassium dichromate is a known human carcinogen, particularly affecting the respiratory tract.
- Causes severe irritation to skin and eyes; ingestion can lead to chemical burns.
Storage: Store in a cool, dry place, away from reducing agents and organic materials.
First Aid:
- Skin Contact: Rinse with plenty of water.
- Eye Contact: Rinse with water for at least 15 minutes.
- Inhalation: Move to fresh air and seek medical attention.
- Ingestion: Drink water and seek medical attention.

Ecotoxicity: Highly toxic to aquatic life and may have long-term adverse effects.
Decomposition Products: Chromium(III) oxide, oxygen.

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