Lead sulfide or sulphide, additionally known as galena or plumbous sulfide, is an chemistry compound used in electronic industry to develop semiconducting materials.
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Formula and structure: lead sulfide chemistry formula is PbS and also its molar fixed is 239.26 g mol-1. Lead sulfide is created by the cation Pb+2 (the lesser oxidized ion the Pb) and also the anion S-2 (the lesser oxidizer ion the S). Lead (II) sulfide has an cubic crystal framework with a unit cells creates by one anion surrounded by 6 cations (it can likewise be thought about one cation surrounding by 6 anions). Its chemistry structure deserve to be composed as below, in the usual representations used for organic molecules.
Occurrence: command (II) sulfide is uncovered in geological formations, particularly, in mineral ores dubbed galena. The is likewise found in the outsider space, for example, on the planet Venus.
Preparation: lead (II) sulfide is extracted from the galena ores, however, there room some chemical approaches to all set this not natural compound. It has actually been largely prepared by the reaction of substitution between hydrogen sulfide gas and also lead nitrate solution.
H2S + Pb(NO3)2 → PbS + 2 HNO3
Physical properties: command (II) sulfide is a black crystalline hard or a silver powder. Its thickness is 7.5 g mL-1. The melting suggest is 1114 ºC and also its boiling allude is 1281 ºC. It is insoluble in water and soluble in nitric mountain hot and hydrochloric acid.
Chemical properties: lead (II) sulfide is one semiconductor, photoconductor and also infrared radiation material. Its capacity is owing the lead atom is a post-transition steel elements, placed in the group 14 and period 6 of periodic table in between the metals and metalloids elements, so the its metallic personality is weak and also has some features of metalloids, such as the semi- or photo- conductivity. Moreover, the lead sulfide is a really inert compound, which an extremely useful to produce electronic components.
Uses: command (II) sulfide has been provided during plenty of years as resource of lead (Pb). The main method to acquire the lead is the smelting that PbS and then, the lead (II) oxide acquired is diminished to Pb and carbon monoxide:
2 PbS + 3 O2 → 2 PbO + 2 SO2
PbO + C → Pb + CO
Moreover, lead (II) sulfide is supplied as semiconductor and photoconductor early its chemical proprieties. That is also used as black color pigment. In recent years, it has been used in to attain nanoparticles to usage in electronic or electric devices.
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Health results / safety and security hazards: lead (II) sulfide is attention by inhalation or ingestion. It can cause strong eye irritation and also corneal destruction. The is no flammable. It emits very toxic vapors as soon as heated.