- Source: Lanthanum hydroxide
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.
La(NO3)3 + 3 NH4OH → La(OH)3 + 3 NH4NO3
Alternatively, it can be produced by hydration reaction (addition of water) to lanthanum oxide.
La2O3 + 3 H2O → 2 La(OH)3
Characteristics
Lanthanum hydroxide does not react much with alkaline substances, however is slightly soluble in acidic solution. In temperatures above 330 °C it decomposes into lanthanum oxide hydroxide (LaOOH), which upon further heating decomposes into lanthanum oxide (La2O3):
La(OH)3
→
−
H
2
O
330
o
C
{\displaystyle \mathrm {{\xrightarrow[{-H_{2}O}]{330\ ^{o}C}}\ } }
LaOOH
2 LaOOH
→
−
H
2
O
Δ
{\displaystyle \mathrm {{\xrightarrow[{-H_{2}O}]{\Delta }}\ } }
La2O3
Lanthanum hydroxide crystallizes in the hexagonal crystal system. Each lanthanum ion in the crystal structure is surrounded by nine hydroxide ions in a tricapped trigonal prism.
References
External links
"Lanthanum - Element information, properties and uses - Periodic Table". rsc.org.
External MSDS 1
External MSDS 2
Lanthanum Oxide MSDS
Kata Kunci Pencarian:
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- Bilangan oksidasi
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- Teknesium
- Kamus rumus kimia
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- Lanthanum hydroxide
- Lanthanum
- Actinium(III) hydroxide
- Lanthanum oxide
- Lanthanum oxalate
- Lanthanide
- Metaphosphate
- Fluoride selective electrode
- RaLa Experiment
- Cerium(IV) hydroxide
