Lithium Hydride
Title: Lithium Hydride
CAS Registry Number: 7580-67-8
Molecular Formula: HLi
Molecular Weight: 7.95
Percent Composition: H 12.68%, Li 87.31%
Line Formula: LiH
Literature References: Prepd by the direct combination of hydrogen and lithium: Gibb, Trans. Electrochem. Soc. 93, 198-211 (1948). Review of prepn and properties: Truter in Mellor's vol. II, supplement II, The Alkali Metals (part 1) 131-145 (1961).
Properties: Cubic crystals, darkens rapidly on exposure to light, the commercial product is usually gray. mp 680°. d 0.76-0.77. No solvent known. Rapidly dec in water to form lithium hydroxide and hydrogen. Reacts with the lower alcohols, carboxylic acids, chlorine, and ammonia at 400° to liberate hydrogen.
Melting point: mp 680°
Density: d 0.76-0.77
CAUTION: Potential symptoms of overexposure are irritation and burns of eyes and skin; burns of mouth and esophagus (if ingested); nausea; muscle twitches; mental confusion; blurred vision. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 186.
Use: Reducing agent; condensing agent with ketones and acid esters; desiccant; in hydrogen generators; 1 g in water liberates ~2.8 liters of hydrogen at STP.

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