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Holmium(III) nitrate

Names
Other names Holmium trinitrate, Holmium nitrate
Identifiers
CAS Number	anhydrous: 10168-82-8 pentahydrate: 14483-18-2 hexahydrate: 35725-31-6
3D model (JSmol)	Interactive image pentahydrate: Interactive image hexahydrate: Interactive image
ChemSpider	anhydrous: 26948008 pentahydrate: 21241428 hexahydrate: 34196
ECHA InfoCard	100.030.386
EC Number	233-438-8
PubChem CID	pentahydrate: 25021754 hexahydrate: 37257
CompTox Dashboard (EPA)	DTXSID40890649 pentahydrate: DTXSID80648469 hexahydrate: DTXSID10189254
InChI InChI=1S/Ho.3NO3/c;3*2-1(3)4/q+3;3*-1Key: WDVGLADRSBQDDY-UHFFFAOYSA-N pentahydrate: InChI=1S/Ho.3NO3.5H2O/c;3*2-1(3)4;;;;;/h;;;;5*1H2/q+3;3*-1;;;;;Key: BJUGWWDCFYEYOA-UHFFFAOYSA-N hexahydrate: InChI=1S/Ho.3NO3.6H2O/c;3*2-1(3)4;;;;;;/h;;;;6*1H2/q+3;3*-1;;;;;;Key: OMTYKYWUMGRKES-UHFFFAOYSA-N
SMILES (=O)().(=O)().(=O)(). pentahydrate: (=O)().(=O)().(=O)().O.O.O.O.O. hexahydrate: (=O)().(=O)().(=O)().O.O.O.O.O.O.
Properties
Chemical formula	Ho(NO3)3
Molar mass	350,95
Appearance	Yellowish crystals
Melting point	754 °C (1,389 °F; 1,027 K)
Solubility in water	Soluble
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H272, H315, H319, H335
Precautionary statements	P210, P220, P221, P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P403+P233, P405, P501
Related compounds
Related compounds	Terbium(III) nitrate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Holmium (III) nitrate is an inorganic compound, a salt of holmium and nitric acid with the chemical formula Ho(NO₃)₃. The compound forms yellowish crystals, dissolves in water, also forms crystalline hydrates.

Synthesis

Anhydrous salt is obtained by the action of nitrogen dioxide on holmium(III) oxide:

${\displaystyle {\mathsf {2Ho_{2}O_{3}+9N_{2}O_{4}\ {\xrightarrow {150^{o}C}}\ 4Ho(NO_{3})_{3}+6NO}}}$

Effect of nitrogen dioxide on metallic holmium:

${\displaystyle {\mathsf {Ho+3N_{2}O_{4}\ {\xrightarrow {200^{o}C}}\ Ho(NO_{3})_{3}+3NO}}}$

Reaction of holmium hydroxide and nitric acid:

${\displaystyle {\mathsf {Ho(OH)_{3}+3NHO_{3}\ \xrightarrow {150^{o}C} \ Ho(NO_{3})_{3}+3H_{2}O}}}$

Physical properties

Holmium(III) nitrate forms yellowish crystals.

Forms a crystalline hydrate of the composition Ho(NO₃)₃•5H₂O.

Soluble in water and ethanol.

Chemical properties

Hydrated holmitic nitrate thermally decomposes to form HoONO
₃ and decomposes to holmium oxide upon subsequent heating.

Application

The compound is used for the production of ceramics and glass.

Also used to produce metallic holmium and as a chemical reagent.

References

1. Лидин, Ростислав; Молочко, Вадим; Андреева, Лариса (2 February 2019). Константы неорганических веществ. Справочник (in Russian). Litres. p. 40. ISBN 978-5-04-077039-7. Retrieved 18 August 2021.
2. "14483-18-2 - Holmium(III) nitrate pentahydrate, REacton®, 99.9% (REO) - 14588 - Alfa Aesar". Alfa Aesar. Retrieved 18 August 2021.
3. "Holmium(III) nitrate pentahydrate". Sigma Aldrich. Retrieved 18 August 2021.

• Holmium compounds
• Nitrates