Lead(II) iodide Chemical Properties
- Melting point:
- 402 °C(lit.)
- Boiling point:
- 954 °C(lit.)
- 6.16 g/mL at 25 °C(lit.)
- Flash point:
- Soluble in concentrated solutions of alkali iodides and sodium thiosulfate. Insoluble in alcohol and cold hydrochloric acid.
- Yellow to orange
- Specific Gravity
- Water Solubility
- Partially soluble in water. Freely soluble in sodium thiosulfate solution. Soluble in concentrated solutions of alkali iodides. Insoluble in alcohol and cold HCl.Soluble in concentrated solutions of alkali iodides and sodium thiosulfate. Insoluble in alcohol and cold hydrochloric acid.
- Light Sensitive
- Hydrolytic Sensitivity
- 0: forms stable aqueous solutions
- Solubility Product Constant (Ksp)
- pKsp: 8.01
- Stable. May discolour upon exposure to light.
- CAS DataBase Reference
- 10101-63-0(CAS DataBase Reference)
- NIST Chemistry Reference
- Lead diiodide(10101-63-0)
- EPA Substance Registry System
- Lead(II) iodide (10101-63-0)
Lead(II) iodide Usage And Synthesis
Lead (II) iodide (chemical formula: PbI) is a kind of inorganic salt. It appears as a bright yellow crystalline solid. It has some special applications such as the manufacture of solar cells, X-rays, and gamma-ray detectors. In addition, it can also be used as a paint pigment for being used in art for bronzing and in gold-like mosaic tiles. It can be commonly synthesized through a double displacement reaction between potassium iodide KI and lead (II) nitrate Pb(NO3)2 in water solution. Lead (II) acetate and sodium iodide can also be used as the substitute of lead nitrate and potassium iodide, respectively. Alternatively, it can be manufactured through the reaction between iodine vapor and the molten lead. It is also used in printing and photography. However, it is hazard to the environment, and should be taken care of to limit spread to the environment.
Golden yellow powder
Lead iodide is a heavy, bright-yellow, odorless powder.
Yellow hexagonal crystals; density 6.16 g/cm3; melts at 402°C; vaporizes at 954°C; decomposes at 180°C when exposed to green light; slightly soluble in water (0.44 g/L at 0°C and 0.63 g/L at 20°C); K下sp 8.49x10-9 at 25°C; partially soluble in boiling water (4.1 g/L at 100°C); insoluble in ethanol; soluble in alkalis and alkali metal iodide solutions.
Used in bronzing, printing, photography, and mosaic gold
Bronzing, gold pencils, mosaic gold, printing, photography.
Lead diiodide is prepared by mixing aqueous solutions of lead nitrate or lead acetate with an aqueous solution of potassium or sodium iodide or hydriodic acid, followed by crystallization. The product is purified by recrystallization.
Pb2+(aq) + 2Iˉ (aq) → PbI2(s).
A yellow crystalline solid. Insoluble in water and denser than water. Primary hazard is threat to the environment. Immediate steps should be taken to limit spread to the environment. Used in printing and photography, to seed clouds and other uses.
Air & Water Reactions
Slightly water soluble.
Lead(II) iodide has weak oxidizing or reducing powers. Redox reactions can however still occur. The majority of compounds in this class are slightly soluble or insoluble in water. If soluble in water, then the solutions are usually neither strongly acidic nor strongly basic. These compounds are not water-reactive. Light sensitive
Lead diiodide is toxic if ingested. The symptoms are those of lead 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.
Lead iodide is used in bronzing, gold pencils; mosaic gold; printing, and photography
UN3288 Toxic solids, inorganic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required. UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required
It crystallises from a large volume of water. The solubility in H2O is 1.1% at ~10o, and 3.3% at ~ 100o.
Lead iodide has weak oxidizing or reducing powers. Redox reactions can however still occur. The majority of compounds in this class are slightly soluble or insoluble in water. If soluble in water, then the solutions are usually neither strongly acidic nor strongly basic. These compounds are not water-reactive. Light sensitive Contact with oxidizers or active metals may cause violent reaction
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