Lanthanum hydroxide

Lanthanum(III) hydroxide

__ La3+ __ OH−

Names
IUPAC name

Lanthanum(III) hydroxide

Identifiers

CAS Number

* 14507-19-8 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 119053

EC Number |

* 238-510-2

PubChem CID

* 135111

UNII |

* 7PTY21U5YN Y

InChI

* InChI=1S/La.3H2O/h;3*1H2

Key: YXEUGTSPQFTXTR-UHFFFAOYSA-K

SMILES

* [OH-].[OH-].[OH-].[La+3]

Properties

Chemical formula

| La(OH)3
Molar mass | 189.93 g/mol

Solubility in water

| Ksp= 2.00·10−21
Structure

Crystal structure

| hexagonal

Space group

| P63/m, No. 176

Lattice constant

a = 6.547 Å, c = 3.854 Å

Hazards
Main hazards | Irritant
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H314

GHS precautionary statements

| P260, P264, P280, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P321, P363, P405, P501
NFPA 704 (fire diamond)  |

~~W~~

Flash point | Non-flammable
Related compounds

Other anions

| Lanthanum(III) chloride

Other cations

| Cerium(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).

N (what is YN ?)
Infobox references

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

## Contents

* 1 Synthesis
* 2 Characteristics
* 3 References
* 4 External links

## 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.[2]

La(NO

3 \+ 3 NH
4OH → La(OH)
3 \+ 3 NH
4NO

Alternatively, it can be produced by hydration reaction (addition of water) to lanthanum oxide.[3]

3 \+ 3 H
2O → 2 La(OH)

## Characteristics

Lanthanum hydroxide does not react much with alkaline substances, however is slightly soluble in acidic solution.[2] In temperatures above 330 °C it decomposes into lanthanum oxide hydroxide (LaOOH), which upon further heating decomposes into lanthanum oxide (La

3):[4]

La(OH)
3 →−H2O330 oC LaOOH

2 LaOOH →−H2OΔ La

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.[5]

## References

1. ↑ "C&L Inventory". https://echa.europa.eu/information-on-chemicals/cl-inventory-database/-/discli/details/123392.
2. ↑ 2.0 2.1 E.V. Shkolnikov (2009). "Thermodynamic Characterization of the Amphoterism of Hydroxides and Oxides of Scandium Subgroup Elements in Aqueous Media". Russian Journal of Applied Chemistry 82 (2): 2098–2104. doi:10.1134/S1070427209120040.
3. ↑ Ding, Jiawen; Wu, Yanli; Sun, Weili; Li, Yongxiu (2006). "Preparation of La(OH)3 and La2O3 with Rod Morphology by Simple Hydration of La2O3". Journal of Rare Earths 24 (4): 440–442. doi:10.1016/S1002-0721(06)60139-7.
4. ↑ Michael E. Brown, Patrick Kent Gallagher (2008). Handbook of Thermal Analysis and Calorimetry. Elsevier. p. 482. ISBN 978-0-44453123-0.
5. ↑ Beall, G.W.; Milligan, W.O.; Wolcott, Herbert A. (1977). "Structural trends in the lanthanide trihydroxides" (in en). Journal of Inorganic and Nuclear Chemistry 39 (1): 65–70. doi:10.1016/0022-1902(77)80434-X.

## External links

* "Lanthanum - Element information, properties and uses - Periodic Table". rsc.org. http://www.rsc.org/periodic-table/element/57/lanthanum.
* External MSDS 1
* External MSDS 2
* Lanthanum Oxide MSDS

* v
* t
* e

Lanthanum compounds

* LaB6
* LaBr3
* LaC2
* LaCl3
* La2(CO3)3
* LaH10
* LaF3
* La2O3
* La(OH)3

* v
* t
* e

Hydroxides

| H2O |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | He

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LiOH | Be(OH)2 |  |  |  |  |  |  |  |  |  |  | B | C | NH3.H2O | O | F | Ne
NaOH | Mg(OH)2 |  |  |  |  |  |  |  |  |  |  | Al(OH)3 | Si | P | S | Cl | HArF (ArHF)
KOH | Ca(OH)2 | Sc(OH)3 | Ti | V | Cr(OH)2
Cr(OH)3 | Mn(OH)2 | Fe(OH)2
Fe(OH)3 | Co(OH)2 | Ni(OH)2 | CuOH
Cu(OH)2 | Zn(OH)2 | Ga(OH)3 | Ge(OH)2 | As | Se | Br | Kr
RbOH | Sr(OH)2 | Y(OH)3 | Zr(OH)4 | Nb | Mo | Tc | Ru | Rh | Pd | AgOH | Cd(OH)2 | In(OH)3 | Sn(OH)2
Sn(OH)4 | Sb(OH)3 | Te | I | Xe
CsOH | Ba(OH)2 | *  | Hf | Ta | W | Re | Os | Ir | Pt | Au(OH)3 | Hg(OH)2 | TlOH
Tl(OH)3 | Pb(OH)2
Pb(OH)4 | Bi(OH)3 | Po | At | Rn
Fr | Ra | **  | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og |  |  |  |  |  |  |  |
|  | ↓ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| * | La(OH)3 | Ce(OH)3 | Pr(OH)3 | Nd(OH)3 | Pm(OH)3 | Sm(OH)3 | Eu(OH)3 | Gd(OH)3 | Tb(OH)3 | Dy(OH)3 | Ho(OH)3 | Er(OH)3 | Tm(OH)3 | Yb(OH)3 | Lu(OH)3 |
| ** | Ac | Th(OH)4 | Pa | UO2(OH)2 | Np | Pu | Am | Cm(OH)3 | Bk | Cf | Es | Fm | Md | No | Lr |

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