picric acid


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picric acid

(pĭk`rĭk) or

2,4,6-trinitrophenol

(trī'nī'trōfē`nōl), C6H2(NO2)3OH, a toxic yellow crystalline solid that melts at 122°C; and is soluble in most organic solvents. Picric acid is a derivative of phenolphenol
, C6H5OH, a colorless, crystalline solid that melts at about 41°C;, boils at 182°C;, and is soluble in ethanol and ether and somewhat soluble in water. An aromatic alcohol, it exhibits weak acidic properties and is corrosive and poisonous.
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. It reacts with metals to form metal picrates, which like picric acid itself are highly sensitive explosivesexplosive,
substance that undergoes decomposition or combustion with great rapidity, evolving much heat and producing a large volume of gas. The reaction products fill a much greater volume than that occupied by the original material and exert an enormous pressure, which can be
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 that can be detonated by heat, flame, shock, or friction. The high explosives lyddite and melinite are composed mostly of compressed or fused picric acid. Picric acid is often used as a booster to detonate another, less sensitive explosive, such as TNT (trinitrotoluenetrinitrotoluene
or TNT
, CH3C6H2(NO2)3, crystalline, aromatic compound that melts at 81°C;. It is prepared by the nitration of toluene.
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). Although picric acid can be synthesized by nitration of phenol, higher yields are obtained if chlorobenzene is used as a starting material; the latter method involves several steps and the formation of several intermediate products. In addition to its use in explosives, picric acid has been used as a yellow dye, as an antiseptic, and in the synthesis of chloropicrin, or nitrotrichloromethane, CCl3NO2, a powerful insecticide.

Picric Acid

 

(or trinitrophenol), an aromatic nitro compound; it is a high explosive whose properties are similar to those of trinitrotoluene. Pour point, 129°C.

In the first quarter of the 20th century, picric acid was used in ammunition. However, its use has been limited because of the high mechanical sensitivity of its metal salts, which form readily (seePICRATES). Trinitrophenol is obtained by the nitration of phe-noldisulfonic acid using a mixture of nitric and sulfuric acids. It is also obtained from dinitrochlorobenzene, with dinitrophenol as an intermediate, and from benzene under the action of nitric acid and Hg(NO3)2.

REFERENCE

Orlova, E. Iu. Khimiia i tekhnologiia brizantnykh vzryvchatykh veshchestv, 2nd ed. Leningrad, 1973.

picric acid

[′pik·rik ′as·əd]
(organic chemistry)
C6H2(NO2)3OH Poisonous, explosive, highly oxidative yellow crystals with bitter taste; soluble in water, alcohol, chloroform, benzene, and ether; melts at 122°C; used in explosives, in external medicines; to make dyes, matches, and batteries, and to etch copper.
References in periodicals archive ?
02 % Riedel-de Haen), aniline (Fluka 98%HPLC grade) and picric acid (B&H of analytical grade were used.
The growth cycle and generation time of the isolates were recorded as per the method of Pal(5) Production of HCN was assayed by modified method of Castric (7) using picric acid indicator papers.
The vessel was laden with TNT, picric acid, gun-cotton (an explosive substance) and drums of benzol fuel.
The dye is picric acid which is not harmful and will disappear next spring as the birds naturally shed their feathers.
The whey was characterized by titrable acidity, pH, conductimetry, proteins by the Kjedahl method, fats by the Gerber method, lactose by picric acid fotometry and sodium and potassium by atomic absorption.
Creatinine was measured colorimetrically by using picric acid in an alkaline environment (11).
Adding to the excruciating pain suffered from the burn and the secondary physiological sequelae, patients were also subjected to wound dressings soaked in carbolic acid or picric acid.
The picric acid, dated 1978, had crystallized, making it still more hazardous, said Mike McCormick, a spokesman for the Los Angeles County Fire Department.
For light microscopy, ink gland samples were fixed with Bouin mixture (saturated picric acid solution, 40% formaldehyde, glacial acetic acid (15:5:1 v/v) and embedded in paraffin.
In 2002, a man aged 43 years was making fireworks by using ammonium nitrate and picric acid when an explosion occurred in his home.
40pm yesterday after police were told about the discovery of a bottle of dry picric acid, also known as tri-nitro phenol, in the engineering department.