Lead fluoride Chemical Properties
- Melting point:
- 824 °C(lit.)
- Boiling point:
- 1293 °C
- 8.445 g/mL at 25 °C(lit.)
- Flash point:
- White to off-white
- Specific Gravity
- Water Solubility
- 0.065 g/100 mL (20 ºC)
- Solubility Product Constant (Ksp)
- pKsp: 7.48
- CAS DataBase Reference
- 7783-46-2(CAS DataBase Reference)
- NIST Chemistry Reference
- Lead difluoride(7783-46-2)
- EPA Substance Registry System
- Lead(II) fluoride (7783-46-2)
Lead fluoride Usage And Synthesis
Colorless orthorhombic crystals or white powder; converts to cubic form at 316°C; density 8.445 g/cm3 (orthorhombic form) and 7.750 g/cm3 (cubic form); melts at 855°C; vaporizes at 1,290°C; slightly soluble in water (640 mg/L at 20°C); KSP 7.12x10–7 at 25°C; soluble in nitric acid; insoluble in acetone and ammonia.
Lead difluoride is used in low melting glasses; in glass coatings to reflect infrared rays; in phosphors for television-tube screens; for nickel plating on glass; and as a catalyst for the manufacture of picoline.
Lead difluoride can be prepared by several methods. It is obtained by treating lead hydroxide or lead carbonate with hydrofluoric acid, followed by evaporation of the solution:
Pb(OH)2 + 2HF → PbF2 + 2H2O
Alternatively, it is precipitated by adding hydrofluoric acid to a lead(II) salt solution; or adding potassium fluoride to lead nitrate solution:
2KF + Pb(NO3)2 → PbF2 + 2KNO3
Lead difluoride also can be directly synthesized from its elements, by the action of lead with fluorine.
Slightly to moderately toxic by ingestion and subcutaneous routes. The oral LD50 in rats is around 3,000 mg/kg.
Lead fluoride is a white to colorless, odorless crystalline (rhombic, orthorhombic) solid
Odorless white solid. Sinks in water.
Calcium carbide mixed with Lead fluoride , at ordinary temperatures, becomes incandescent [Mellor 5:862-64. 1946-47].
Not irritating to skin or mucuous membranes; protect against chronic poisoning. Early symptoms of lead intoxication via inhalation or ingestion are most commonly gastrointestinal disorders, colic, constipation, etc.; weakness, which may go on to paralysis chiefly of the extensor muscles of the wrists and less often the ankles, is noticeable in the most serious cases. Ingestion of a large amount causes local irritation of the alimentary tract; pain, leg cramps, muscle weakness, paresthesias, depression, coma, and death may follow in 1 or 2 days. Contact with eyes causes irritation.
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Used to make other chemicals, underwater paints; electronic and optical parts (for growing single-crystal, solid-state lasers); in high-temperature dryfilm lubricants; and making special grades of glass.
UN3288 Toxic solids, inorganic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required. UN2291 Lead compounds, soluble n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required
Violent reaction with oxidizers, chemically active metals; calcium carbide. May ignite combustibles, such as wood, paper, oil, etc
- Lead(II) sulfide
- LEAD ZIRCONATE
- Lead(II) chloride
- lead fluoride hydroxide
- Potassium fluoride
- sodium fluoride
- Sulfur hexafluoride
- Hydrofluoric acid
- Ammonium fluoride
- FLUORIDE STANDARD
- Ammonium hydrogen difluoride
- Aluminum fluoride
- Sodium fluoride
- LEAD TETRAFLUORIDE
- Lead fluoride
- Boron trifluoride
Lead fluoride SupplierMore
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