Lead(II) sulfide
Cubic
Pb, S
Lead sulfide
Black, odorless solid
Fixed
7.5 g · cm -3
1114 ° C
- Sparingly soluble in water
- Soluble in nitric acid
Risk
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Lead (II) sulfide, is a chemical compound of the elements lead, and sulfur. It is a salt with the empirical formula PbS.
Occurrence
Lead (II ) sulfide occurs naturally in large quantities as the mineral galena ( galena ) ago.
Production and representation
Lead (II ) sulfide can be prepared by passing hydrogen sulfide or the addition of a solution of sodium sulfide in a lead- chloride solution.
While in the precipitation of lead - salt solutions purely amorphous or partially crystallized lead (II ) sulfide precipitates are obtained, can be prepared by reacting Natriumtetrahydroxoplumbat (II ) solution with thiourea, a uniformly crystallized lead (II ) sulphide of approximately uniform represent crystal size.
Properties
Lead (II ) sulfide forms large, lead- gray, lustrous metal crystals, which can be split easily. The lattice structure corresponds to that of sodium chloride.
The compound is sparingly soluble in water, as in a cold dilute hydrochloric acid and sulfuric acid. By introducing hydrogen sulfide into a lead (II ) salt solution falls due to the exceeding of the solubility product, a black precipitate of PbS from:
This hypersensitivity can be very small traces of lead detected in the water. Easily soluble contrast is lead (II ) sulphide in nitric acid. In concentrated hydrochloric acid it decomposes into hydrogen sulfide under development:
Lead (II ) sulfide melts at 1114 ° C.
Upon heating in air ( roasting ), the compound finally burns independently lead (II ) oxide:
Use
Lead sulphide is a semiconductor and is used as a detector material for infra-red receiver (eg telescopic ). It is also used as a vulcanization accelerator in the rubber industry and as a raw material in the glass and ceramics industries.