Thorium(IV) nitrate

Thorium(IV) nitrate
Identifiers
CAS Number	(anhydrous): 13823-29-5 ; (trihydrate): 87174-21-8 ; (tetrahydrate): 13470-07-0 ; (pentahydrate): 14767-04-5 ; (hexahydrate): 23739-44-8 ;
3D model (JSmol)	(anhydrous): Interactive image; (tetrahydrate): Interactive image; (pentahydrate): Interactive image; (hexahydrate): Interactive image;
ChemSpider	(anhydrous): 24497;
ECHA InfoCard	100.034.090
EC Number	(anhydrous): 237-514-1;
PubChem CID	(anhydrous): 26293; (tetrahydrate): 134672; (pentahydrate): 92043287; (hexahydrate): 129688133;
UNII	(anhydrous): IF944P467K ; (tetrahydrate): 66RXJ6ZF36 ;
CompTox Dashboard (EPA)	(anhydrous): DTXSID4065656 ;
	InChI (anhydrous): InChI=1S/4NO3.Th/c42-1(3)4;/q4-1;+4 Key: VGBPIHVLVSGJGR-UHFFFAOYSA-N; (tetrahydrate): InChI=1S/4NO3.4H2O.Th/c42-1(3)4;;;;;/h;;;;41H2;/q4-1;;;;;+4 Key: VAVIMIAZQDNXID-UHFFFAOYSA-N; (pentahydrate): InChI=1S/4NO3.5H2O.Th/c42-1(3)4;;;;;;/h;;;;51H2;/q4-1;;;;;;+4 Key: JFVMRMIHIHCMDY-UHFFFAOYSA-N; (hexahydrate): InChI=1S/4NO3.6H2O.Th/c42-1(3)4;;;;;;;/h;;;;61H2;/q4*-1;;;;;;;+4 Key: HLGOSPFVTORIQZ-UHFFFAOYSA-N;
	SMILES (anhydrous): [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[Th+4]; (tetrahydrate): [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].O.O.O.O.[Th+4]; (pentahydrate): [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].O.O.O.O.O.[Th+4]; (hexahydrate): [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].O.O.O.O.O.O.[Th+4];
Properties
Chemical formula	Th(NO3)4
Molar mass	480.066 (anhydrous); 552.130 (tetrahydrate); 570.146 (pentahydrate);
Appearance	Colorless crystal
Density	2.8 g/cm3
Melting point	55 °C (131 °F; 328 K)
Boiling point	Decomposes
Solubility in water	4.013 mol/L at (25 °C (77 °F; 298 K))
Solubility	alcohols, ketones, esters and ethers
Vapor pressure	0.7 torrs (93 Pa) (25 °C (77 °F; 298 K)); 1.2 torrs (160 Pa) (42 °C (108 °F; 315 K)); 10.7 torrs (1.43 kPa) (68 °C (154 °F; 341 K));
Structure
Crystal structure	orthorhombic
Lattice constant	a = 1.1191 nm, b = 2.2889 nm, c = 1.0579 nm (pentahydrate)
Thermochemistry
Heat capacity (C)	480.83 J/(K·mol)
Std enthalpy of; formation (ΔfH⦵298)	−2.29 kJ/(K·mol)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H272, H302, H315, H319, H335, H373, H411
Precautionary statements	P210, P220, P221, P260, P264, P270, P271, P273, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P312, P314, P321, P330, P332+P313, P337+P313, P362, P370+P378, P391, P403+P233, P405, P501 Preview warning: Omit Rules: keep P260, omit P261
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Thorium(IV) nitrate is a chemical compound, a salt of thorium and nitric acid with the formula Th(NO₃)₄. A white solid in its anhydrous form, it can form tetra- and pentahydrates. As a salt of thorium it is weakly radioactive.