Lead sulfide or sulphide, likewise known together galena or plumbous sulfide, is an chemical compound provided in electronic industry to create semiconducting materials.
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Formula and structure: lead sulfide chemical formula is PbS and also its molar mass is 239.26 g mol-1. Command sulfide is formed by the cation Pb+2 (the lesser oxidized ion of Pb) and the anion S-2 (the lesser oxidizer ion the S). Lead (II) sulfide has actually an cubic crystal framework with a unit cells develops by one anion surrounding by 6 cations (it can additionally be taken into consideration one cation surrounded by 6 anions). Its chemistry structure can be written as below, in the typical representations supplied for essential molecules.
Occurrence: lead (II) sulfide is found in geology formations, particularly, in mineral ores dubbed galena. The is additionally found in the outsider space, for example, on the world Venus.
Preparation: lead (II) sulfide is extract from the galena ores, however, there room some chemical methods to all set this not natural compound. It has actually been greatly prepared by the reaction the 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 melting suggest is 1114 ºC and also its boiling point is 1281 ºC. The is insoluble in water and also soluble in nitric acid hot and hydrochloric acid.
Chemical properties: lead (II) sulfide is an semiconductor, photoconductor and infrared radiation material. Its capacity is owing the command atom is a post-transition metal elements, put in the team 14 and period 6 of regular table in between the metals and metalloids elements, so the its metallic personality is weak and has some qualities of metalloids, such as the semi- or photo- conductivity. Moreover, the command sulfide is a really inert compound, which really useful to produce electronic components.
Uses: command (II) sulfide has been used during numerous years as source of lead (Pb). The main method to acquire the command is the smelting of PbS and also then, the command (II) oxide derived is lessened 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 early its chemistry proprieties. That is likewise used as black color pigment. In recent years, it has been supplied in to achieve nanoparticles to use in electronic or electrical devices.
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Health results / security hazards: lead (II) sulfide is attention by inhalation or ingestion. It can cause solid eye irritation and also corneal destruction. The is not flammable. The emits an extremely toxic vapors when heated.