Lanthanum hydroxide

Lanthanum(III) hydroxide
Names
IUPAC name
Lanthanum(III) hydroxide
Identifiers
ECHA InfoCard 100.034.994
EC Number 238-510-2
Properties
La(OH)3
Molar mass 189.93 g/mol
Ksp= 2.00*10−21
Hazards
Main hazards Irritant
R-phrases (outdated) R36/37
S-phrases (outdated) S26, S22, S37/39
NFPA 704
Flammability (red): no hazard codeHealth code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentineReactivity (yellow): no hazard codeSpecial hazard W: Reacts with water in an unusual or dangerous manner. E.g., cesium, sodiumNFPA 704 four-colored diamond
1
Flash point Non-flammable
Related compounds
Other anions
 Lanthanum(III) chloride
Other cations
 Cerium(III) hydroxide
Scandium(III) hydroxide
Yttrium(III) hydroxide
Actinium(III) hydroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Lanthanum hydroxide is La(OH)
3, a hydroxide of the rare-earth element lanthanum.

Synthesis

Lanthanum hydroxide can be obtained by adding an alkali such as ammonia to aqueous solutions of lanthanum salts such as lanthanum nitrate. This produces a gel-like precipitate that can then be dried in air. [1]


Alternatively, it can be produced by hydration reaction (addition of water) to Lanthanum oxide. [2]


Characteristics

Lanthanum hydroxide does not react much with alkaline substances, however is slightly soluble in acidic solution. [1] In temperatures above 330 °C it decays into Lanthanum peroxide, LaOOH, which, upon further heating, decomposes into Lanthanum oxide. [3]


References

  1. 1 2 E.V. Shkolnikov: Thermodynamic Characterization of the Amphoterism of Hydroxides and Oxides of Scandium Subgroup Elements in Aqueous Media, in: Russian Journal of Applied Chemistry, 2009, 82 (2), S. 2098–2104.
  2. ↑ Jiawen Ding, Yanli Wu, Weili Sun, Yongxiu Li: Preparation of La(OH)3 and La2O3 with Rod Morphology by Simple Hydration of La2O3, in: Journal of Rare Earths, 2006 August, 24 (4), S. 440-442; doi:10.1016/S1002-0721(06)60139-7.
  3. ↑ Michael E. Brown, Patrick Kent Gallagher: Handbook of Thermal Analysis and Calorimetry, S. 482; ISBN 978-0-44453123-0.
  • "Lanthanum - Element information, properties and uses - Periodic Table". rsc.org.
  • External MSDS 1
  • External MSDS 2
  • Lanthanum Oxide MSDS


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