Cadmium iodide
Synonym(s):Cadmium diiodide
- CAS NO.:7790-80-9
- Empirical Formula: CdI2
- Molecular Weight: 366.22
- MDL number: MFCD00010920
- EINECS: 232-223-6
- SAFETY DATA SHEET (SDS)
- Update Date: 2023-04-23 13:52:06
What is Cadmium iodide?
Chemical properties
Pearly white flakes or a crystalline powder
Physical properties
White, hexagonal flakes or crystals; slowly turns yellow upon exposure to air or light; occurs in two allotropic forms, the alpha and beta forms; density 5.67 g/cm3; melts at 387°C (alpha form) and 404°C (beta form); vaporizes at 742°C; vapor pressures 1 and 5 torr at 416 and 481°C, respectively; soluble in water (86 g/100 mL at 25°C), ethanol, acetone, ether, and ammonia.
The Uses of Cadmium iodide
Cadmium iodide is used in lithography, photography, electroplating and the manufacturing of phosphors, in engraving process, and was used as an antiseptic and astringent.
The Uses of Cadmium iodide
Used in photography, analytical chemistry, manufacturing of phosphors, lubricants
The Uses of Cadmium iodide
In electrodeposition of Cd; as nematocide; in manufacture of phosphors; as lubricant; in photoconductors; in photography, process engraving; lithography; in analytical chemistry.
The Uses of Cadmium iodide
Made by the action of hydriodic acid on cadmium oxide and crystallization. The colorless, flaky crystals are soluble in water, alcohol, and ether. This halide was a common iodizer for collodion formulas, particularly for negatives.
Preparation
Cadmium iodide is prepared by the addition of cadmium metal, or its oxide, hydroxide, nitrate or carbonate to hydriodic acid:
CdO + 2HI → CdI2 + H2O
Also, the compound can be made by heating cadmium with iodine:
Cd +I2 → CdI2
A brownish crystalline β-form of the salt may be obtained by slow crystallization from solutions or fused salt mixtures.
Purification Methods
Crystallise it from ethanol (2mL/g) by partial evaporation. [Wagenknecht & Juza in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1096 1965.]
Properties of Cadmium iodide
Melting point: | 388 °C (lit.) |
Boiling point: | 787 °C (lit.) |
Density | 5.67 g/mL at 25 °C (lit.) |
Flash point: | 787°C |
solubility | It is soluble in ethanol, acetone, ether and ammonia. |
form | beads |
color | White to yellow |
Specific Gravity | 5.67 |
Water Solubility | Very soluble in water, slightly soluble in acetone, ethanol and diethyl ether. |
Sensitive | Hygroscopic |
Merck | 14,1621 |
Exposure limits | ACGIH: TWA 0.01 mg/m3; TWA 0.002 mg/m3; TWA 0.01 ppm NIOSH: IDLH 9 mg/m3 |
CAS DataBase Reference | 7790-80-9(CAS DataBase Reference) |
EPA Substance Registry System | Cadmium iodide (7790-80-9) |
Safety information for Cadmium iodide
Signal word | Danger |
Pictogram(s) |
Skull and Crossbones Acute Toxicity GHS06 Health Hazard GHS08 Environment GHS09 |
GHS Hazard Statements |
H351:Carcinogenicity H373:Specific target organ toxicity, repeated exposure H410:Hazardous to the aquatic environment, long-term hazard |
Precautionary Statement Codes |
P201:Obtain special instructions before use. P202:Do not handle until all safety precautions have been read and understood. P260:Do not breathe dust/fume/gas/mist/vapours/spray. P273:Avoid release to the environment. P301+P310:IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. |
Computed Descriptors for Cadmium iodide
InChIKey | OKIIEJOIXGHUKX-UHFFFAOYSA-L |
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