Lead(II) thiocyanate
| Names | |
|---|---|
|
IUPAC name
Lead(II) thiocyanate
|
|
|
Systematic IUPAC name
Lead(II) thiocyanate
|
|
| Other names
Lead dithiocyanate, lead isothiocyanate, lead sulfocyanate, lead thiocyanate, lead thiocyanate (Pb(SCN) 2), lead(II) thiocyanate, lead(II) thiocyanate (Pb(NCS) 2), thiocyanic acid, lead(2+) salt
|
|
| Identifiers | |
|
3D model (JSmol)
|
|
| ChemSpider | |
| ECHA InfoCard | 100.008.887 |
|
PubChem CID
|
|
|
|
|
|
| Properties | |
| Pb(SCN)2 | |
| Molar mass | 323.3648 g/mol |
| Appearance | white or light yellow powder |
| Odor | odorless |
| Density | 3.82 g/cm3 |
| Melting point | 190 °C (374 °F; 463 K) |
| 0.553 g/100 mL | |
| Solubility | soluble in nitric acid |
| −82.0·10−6 cm3/mol | |
| Hazards | |
| R-phrases (outdated) | R61 R20/21/22 R32 R33 R50/53 R62 |
| S-phrases (outdated) | S53 S13 S45 S60 S61 |
| NFPA 704 | |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
|
 (what is   ?) |
|
| Infobox references | |
Lead(II) thiocyanate is a compound, more precisely a salt, with the formula Pb(SCN)2.It is a white crystalline solid, but will turn yellow upon exposure to light. It is soluble in water and can be converted to a basic salt (Pb(CNS)2*Pb(OH)2 when boiled. Salt crystals may form upon cooling. Lead thiocyanate can cause lead poisoning if ingested and can adversely react with many substances. It has use in small explosives, matches, and dyeing.
Lead(II) thiocyanate is reasonably soluble at room temperature, thus it may be difficult to identify in a solution with low concentration of lead(II) thiocyanate. Although it has not been confirmed by other sources than the author of this article, experiments show that even if there is no precipitation of lead(II) thiocyanate in the solution, crystals of the salt may form.
Lead(II) thiocyanate can be formed from the acidification of Lead Nitrate Pb(NO3)2 with nitric acid (HNO3) in the presence of Thiocyanic acid (HSCN)
Lead(II) thiocyanate may be made by reacting lead(II) acetate (Pb(CH3COO)2) solved in water with either potassium thiocyanate (KSCN) or ammonium thiocyanate (NH4SCN), thus causing a white precipitation of solid lead(II) thiocyanate.
Ion reaction:
When exposed to UV or visible light lead thiocyanate will turn yellow due to the presence of sulfur. It is violently oxidized by nitric acid and will releases hydrogen cyanide gas after contact with acid, which is toxic. High amounts of heat such as that produces in a house fire will releases sulfur dioxide gas, also toxic. Like other metal cyanides, Lead thiocyanate explodes on heating when mixed with sodium nitrite.
...
Wikipedia