Sodium hydride

Sodium hydride
	Sodium cation, Na+ Hydrogen anion, H−
Names
	IUPAC name Sodium hydride
Identifiers
CAS Number	7646-69-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	23144 ;
ECHA InfoCard	100.028.716
EC Number	231-587-3;
PubChem CID	24758;
UNII	23J3BHR95O ;
UN number	1427
CompTox Dashboard (EPA)	DTXSID90893680 ;
	InChI InChI=1S/Na.H Key: MPMYQQHEHYDOCL-UHFFFAOYSA-N ; InChI=1/Na.H/q+1;-1 Key: BZKBCQXYZZXSCO-UHFFFAOYAY; InChI=1S/Na.H/q+1;-1 Key: BZKBCQXYZZXSCO-UHFFFAOYSA-N;
	SMILES [H-].[Na+];
Properties
Chemical formula	NaH
Molar mass	23.998 g·mol−1
Appearance	white or grey solid
Density	1.39 g/cm3
Melting point	425 °C (797 °F; 698 K) (decomposes)
Solubility in water	Reacts with water
Solubility	insoluble in all solvents
Band gap	3.51 eV (predicted)
Refractive index (nD)	1.470
Structure
Crystal structure	fcc (NaCl), cF8
Space group	Fm3m, No. 225
Lattice constant	a = 4.98 Å
Formula units (Z)	4
Coordination geometry	Octahedral (Na+); Octahedral (H−);
Thermochemistry
Heat capacity (C)	36.4 J·mol-1·K-1
Std molar; entropy (S⦵298)	40.0 J·mol-1·K-1
Std enthalpy of; formation (ΔfH⦵298)	−56.3 kJ⋅mol−1
Gibbs free energy (ΔfG⦵)	−33.5 kJ⋅mol−1
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	highly corrosive, reacts violently with water or humid air.
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H228, H260, H290, H314
Precautionary statements	P210, P223, P231+P232, P234, P240, P241, P260, P264, P280, P301+P330+P331, P302+P335+P334, P303+P361+P353, P304+P340+P310, P305+P351+P338+P310, P363, P370+P378, P390, P402+P404, P405, P501 Preview warning: Omit Rules: keep P234, omit P406
NFPA 704 (fire diamond)	3 3 2 W
Flash point	185 °C (365 °F; 458 K) (closed cup)
Related compounds
Other anions	Sodium borohydride; Sodium hydroxide;
Other cations	Lithium hydride; Potassium hydride; Rubidium hydride; Caesium hydride;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium hydride is the chemical compound with the empirical formula Na H. This alkali metal hydride is primarily used as a strong yet combustible base in organic synthesis. NaH is a saline (salt-like) hydride, composed of Na⁺ and H⁻ ions, in contrast to molecular hydrides such as borane, silane, germane, ammonia, and methane. It is an ionic material that is insoluble in all solvents (other than molten sodium metal), consistent with the fact that H⁻ ions do not exist in solution.