Lanthanum hydroxide
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| Names | |
|---|---|
| IUPAC name
Lanthanum(III) hydroxide
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| Identifiers | |
| ECHA InfoCard | 100.034.994 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| La(OH)3 | |
| Molar mass | 189.93 g/mol |
| Ksp= 2.00*10−21 | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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Irritant |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions
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Lanthanum(III) chloride |
Other cations
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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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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]
![{\displaystyle \mathrm {La(OH)_{3}\ {\xrightarrow[{-H_{2}O}]{330^{o}C}}\ LaOOH} }](https://wikimedia.org/api/rest_v1/media/math/render/svg/a0c076bb7e12b3c057109c7caaa550285bb85139)
![{\displaystyle \mathrm {2\ LaOOH\ {\xrightarrow[{-H_{2}O}]{\Delta }}\ La_{2}O_{3}} }](https://wikimedia.org/api/rest_v1/media/math/render/svg/fcf068415d4e63b6e97eeae2941dfdf7d8b69b9d)
References
- ^ a b 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.
- ^ 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.
- ^ Michael E. Brown, Patrick Kent Gallagher: Handbook of Thermal Analysis and Calorimetry, S. 482; ISBN 978-0-44453123-0.
External links
- "Lanthanum - Element information, properties and uses - Periodic Table". rsc.org.
- External MSDS 1
- External MSDS 2
- Lanthanum Oxide MSDS
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