Chemical elements
  Lithium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Lithium hydride
      Lithium chloride
      Lithium bromide
      Lithium iodide
      Lithium iodide tetrachloride
      Lithium hypochlorite
      Lithium chlorate
      Lithium perchlorate
      Lithium bromate
      Lithium iodate
      Lithium periodates
      Lithium monoxide
      Lithium peroxide
      Lithium hydroxide
      Lithium monosulphide
      Lithium polysulphides
      Lithium sulphite
      Lithium sulphate
      Lithium persulphate
      Lithium thiosulphate
      Lithium dithionate
      Lithium selenide
      Lithium selenite
      Lithium selenate
      Lithium chromate
      Lithium permanganate
      Lithium molybdates
      Lithium nitride
      Lithium hydrazoate
      Lithamide
      Lithium nitrite
      Lithium nitrate
      Lithium phosphide
      Lithium orthophosphate
      Lithium pyrophosphate
      Lithium metaphosphate
      Lithium arsenide
      Lithium meta-arsenite
      Lithium arsenate
      Lithium antimonide
      Lithium antimonate
      Lithium carbide
      Lithium carbonate
      Lithium percarbonate
      Lithium cyanide
      Lithium thiocyanate
      Lithium silicide
      Lithium silicates
      Lithium borates

Lithium monosulphide, Li2S






The Lithium monosulphide, Li2S can be prepared by direct synthesis or by reduction of the sulphate with charcoal. The yellow product is amorphous, but heating in the electric furnace transforms it into transparent cubes of specific gravity 1.63 to 1.7. Evaporation of its aqueous solution yields hygroscopic crystals of the hydrosulphide, LiSH:

Li2S+H2OLiSH+LiOH.

This decomposition is similar to that undergone by other alkali-metal sulphides. The heat of formation of the hydrosulphide in dilute solution is given by the equation

[Li]+[S](rhombic)+(H)+Aq. =LiSH,Aq.+68.3 Cal.


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