Lead sulfide or sulphide, likewise known together galena or plumbous sulfide, is an chemical compound supplied in digital industry to develop semiconducting materials.
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Formula and structure: command sulfide chemistry formula is PbS and also its molar fixed is 239.26 g mol-1. Lead sulfide is formed by the cation Pb+2 (the lesser oxidized ion the Pb) and the anion S-2 (the lesser oxidizer ion that S). Command (II) sulfide has actually an cubic crystal framework with a unit cells creates by one anion surrounded by 6 cations (it can also be taken into consideration one cation surrounding by 6 anions). Its chemistry structure can be written as below, in the usual representations offered for necessary molecules.
Occurrence: command (II) sulfide is uncovered in geology formations, particularly, in mineral ores referred to as galena. The is also found in the outsider space, for example, on the earth Venus.
Preparation: lead (II) sulfide is extract from the galena ores, however, there are some chemical methods to all set this not natural compound. It has actually been mainly prepared by the reaction of substitution between hydrogen sulfide gas and lead nitrate solution.
H2S + Pb(NO3)2 → PbS + 2 HNO3
Physical properties: lead (II) sulfide is a black color crystalline solid or a silver powder. Its density is 7.5 g mL-1. That is melting allude is 1114 ºC and its boiling suggest is 1281 ºC. The is insoluble in water and soluble in nitric acid hot and hydrochloric acid.
Chemical properties: lead (II) sulfide is an semiconductor, photoconductor and infrared radiation material. Its volume is owing the lead atom is a post-transition metal elements, put in the group 14 and period 6 of routine table between the metals and metalloids elements, so that its metallic personality is weak and has some qualities of metalloids, such as the semi- or photo- conductivity. Moreover, the lead sulfide is a really inert compound, which very useful to produce electronic components.
Uses: lead (II) sulfide has actually been used during numerous years as source of lead (Pb). The main technique to attain the lead is the smelting the PbS and then, the command (II) oxide obtained is reduced to Pb and carbon monoxide:
2 PbS + 3 O2 → 2 PbO + 2 SO2
PbO + C → Pb + CO
Moreover, command (II) sulfide is supplied as semiconductor and photoconductor due its chemical proprieties. The is likewise used as black color pigment. In recent years, it has actually been provided in to obtain nanoparticles to usage in digital or electrical devices.
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Health results / security hazards: lead (II) sulfide is attention by inhalation or ingestion. It can cause strong eye irritation and corneal destruction. That is not flammable. The emits very toxic vapors as soon as heated.