Chemical elements
  Lanthanum
    Isotopes
    Energy
    Production
    Application
    Chemical properties
      Lanthanum chloride
      Lanthanum iodide
      Lanthanum perchlorate
      Lanthanum bromate
      Lanthanum iodate
      Lanthanum periodate
      Lanthanum sesquioxide
      Lanthana
      Lanthanum hydroxide
      Lanthanum peroxide
      Lanthanum persulphide
      Lanthanum sulphate
      Lanthanum dithionate
      Lanthanum selenite
      Lanthanum selenate
      Lanthanum chromate
      Lanthanum azide
      Lanthanum hydrazoate
      Lanthanum trinitride
      Lanthanum nitrate
      Lanthanum phosphite
      Lanthanum orthophosphate
      Lanthanum hydrogen pyrophosphate
      Lanthanum metaphosphate
      Lanthanum arsenates
      Lanthanum carbonate
      Lanthanum thiocyanate
      Lanthanum platinocyanide
      Lanthanum acetate
      Lanthanum oxalate
    PDB 1djg-2rpv

Chemical properties of Lanthanum





Compounds of Lanthanum

The salts of lanthanum are derived from the colourless basic oxide La2O3, and, if derived from colourless acids, are themselves colourless. Their aqueous solutions are devoid of absorption spectra.

The following values for the equivalent conductivities X of a number of lanthanum salts at 25° are in harmony with the view that the salts are derived from a fairly strong triacid base (v = dilution in litres per gram-equivalent): -

LaCl3v=21.342.685.2170.6341.1682.21364.5
λ=101.7108.6114.9122.3126.5131.9136.4
La(NO3)3v=32641282565121024
λ=98.6105.4112.8118.1124.1126.5
La2(SO4)3v=33.8667.72135.44270.88541.761083.52
λ=43.5850.3058.4968.8980.9396.26


Noyes and Johnston have measured the equivalent conductivities of dilute solutions of lanthanum nitrate and sulphate over a wide range of temperature, and Johnston has calculated from the results that the ionic conductivity of the lanthanum ion varies with the temperature as follows: -

Temp. ° C.18°25°50°75°100°128°156°
La•••356172119173235312388


Thermochemistry of Lanthanum

2[La] + 3(O) = [La2O3] + 444.7 Cals.
[La] + 4[Al] = [LaAl4] + 97.8 Cals.
[La2O3] + 6HClaq. = 2LaCl3aq. + 3H2O + 114.6 Cals.
[La2O3] + 6(HCl) = 2[LaCl3] + 3[H2O] + 160.6 Cals.
[La] + 3(Cl) = [LaCl3] + 263.0 Cals.
[LaCl3] + Aq. = LaCl3aq. + 31.3 Cals.
[La2O3] + 3[H2SO4] = [La2(SO4)3] + 3[H2O] + 138.2 Cals.
La2(SO4)3 + Aq. = La2(SO4)3aq + 34.6 Cals.
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