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 iodide, LiI






On evaporation of the solution obtained by the interaction of lithium carbonate and hydriodic acid, or barium or calcium iodide, lithium iodide crystallizes in the form of hydrates, a trihydrate, dihydrate, and monohydrate having been isolated. Above 300° C. the anhydrous salt is formed, but its action on glass and porcelain at high temperatures has prevented its preparation in the pure state. The boiling-point of the iodide is 1170° C., and the vapour-pressure in atmospheres corresponds with the expression

log p = -40300/4.57T+6.105.

The excessive solubility of the iodide is shown by the table -

Temperature, °C0102030405060708099120
Grams LiI in 100 g. H2O. 151157165171179187202230433476588


Other properties of dilute aqueous solutions have been studied by several investigators. The heat of formation in aqueous solution can be calculated like that of the chloride or bromide, and is given by the expression

[Li]+[I].+Aq.=LiI,Aq.+80.l Cal.;

and, since the heat of solution is 14.9 Cal., the heat of formation of the anhydrous iodide from lithium and iodine is expressed by

[Li]+[I]=[LiI]+65.2 Cal.

Lithium iodide resembles the chloride and bromide in the formation of double compounds with alcohols. At 25° C., 250.8 grams of the salt dissolve in 100 grams of ethyl alcohol. With propyl alcohol it yields a complex of the formula

LiI,4C3H7-OH.

Like the other halides, lithium iodide forms double salts with other metallic iodides, such as those of mercury and lead.


© Copyright 2008-2012 by atomistry.com