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  Home >> Inorganic Chemistry Dictionary >> Lead thiocyanate Lewis acid and base theory

Lead tetraethyl
(tetraethyl lead Pb(CH2CH3)4), a poisonous liquid that is insoluble in water but soluble in organic solvent. It may be manufactured by the reaction of an alloy of sodium and lead with 1 chloroethane. The product is obtained by steam distillation. Lead tetraethyl finds use as an additive in internal combustion engine fuel to increase its octane number.

Lead tetraoxide, Pb3O4
It is obtained by heating litharge in excess of air. 6 PbO + O2 Pb3O4.it is known as red lead. It is used in pigment (red pigment) and in manufacturing of matches.

Lead tetroxide
Pb3O4, a poisonous, brightred powder; soluble in excess glacial acetic acid and dilute hydrochloric acid; used in medicine, in cement for special applications, in manufacture of colourless glass, and in ship paint. Also known as lead orthoplumbate; lead oxide red; red lead.

Lead thiocyanate
Pb(SCN)2, yellow, monoclinic crystals, soluble in potassium thiocyanate and slightly soluble in water, used in the powder mixture that primes small arm cartridges, in dyes, and in safety matches.

Lead titanate
PbTiO3, a water-insoluble, pale-yellow solid; used as colouring matter in paints.

Lead tungstate
PbWO4, a yellowish powder, melting at 11300C; insoluble in water, soluble in acid; used as a pigment. Also known as lead wolframate.

Lenacil
C13H18N2O2. a colorless, crystalline compound with a melting point of 316-3170C; slight solubility in water; used as an herbicide to control weeds in sugarbeets, cereal grains, and strawberries. Also known as 3-cyclohexyl-5, 6-trimethyleneuracil.

Lewis acid and base theory
An acid has a molecule or ion that can accept a pair of electrons to form a covalent bond. A base has a molecule or ion that can donate a pair, of electrons to form a covalent bond. This is a much broader concept of acids and bases than that of the Bronsted-Lowry theory.

Lithium aluminium hydride
LiAIH2, a compound made by the reaction of lithium hydride and aluminium chloride; a powerful reducing agent for specific linkage in complex molecules; used in organic synthesis.

Lithium amide
LiNH2, a compound crystallizing in the cubic form, and melting at 380-4000C; used on organic synthesis. Also known as lithamide.

Lithium bromide
Libr.H2O, a white, deliquescent, granular powder with a bitter taste, melting at 5470C; soluble in alcohol and glycol; used to add moisture to air-conditioning systems and as a sedative and hypnotic in medicine.

Lithium halide
A binary compound of lithium, LiX, where X is a halide; examples are lithium chloride, LiCI, and lithium flurodie, LiF.

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