formic acid

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formic acid

or

methanoic acid

(mĕth'ənō`ĭk), HCO2H, a colorless, corrosive liquid with a sharp odor; it boils at 100.7°C; and solidifies at 8.4°C;. It has the lowest molecular weight and is the simplest of the carboxylic acids. Functionally, it is both an acid and an aldehyde. Like other acids, it reacts with most alcohols to form esters and decomposes when heated; like other aldehydes, it is easily oxidized. Formic acid occurs in the bodies of red ants and in the stingers of bees. It can be made by the oxidation of formaldehydeformaldehyde
, HCHO, the simplest aldehyde. It melts at −92°C;, boils at −21°C;, and is soluble in water, alcohol, and ether; at STP, it is a flammable, poisonous, colorless gas with a suffocating odor.
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; it is prepared commercially by heating carbon monoxide and sodium hydroxide to form sodium formate which, when carefully treated with sulfuric acid, yields formic acid. Formic acid is used industrially in textile dyeing, in leather tanning, and in coagulating latex rubber.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Formic Acid

 

the simplest monobasic carboxylic acid, HCOOH. It is a colorless, highly mobile liquid with a sharp odor. Melting point, 8.25°C; boiling point, 100.7°C; density, 1.2126 g/cm (20°C). Formic acid is miscible in all proportions with water, alcohol, and ether; it forms an azeotropic mixture with water (77.4 percent formic acid; boiling point, 107.2°C). Formic acid causes burns upon contact with the skin.

Formic acid is the strongest fatty acid. In addition to properties typical of carboxylic acids (for example, the formation of salts and esters, called formates), it has reducing properties characteristic of aldehydes. For example, upon heating with an ammonia solution of silver oxide, it forms a “silver mirror.” Formic acid is found in fir needles, nettles, fruits, and the caustic secretions of bees and ants (it was discovered in the caustic secretions of ants as early as the 17th century; hence its name, derived from the Latin formica, meaning “ant”).

In industry, formic acid is produced mainly from solid sodium hydroxide and carbon monoxide (6–8 atmospheres at 120°-150°C). The resulting sodium formate, HCOONa, is decomposed by sulfuric acid.

Formic acid is used in mordant dyeing; for the decalcification of skins in their preparation for tanning; in the production of a number of catalysts (for example, nickel-containing catalysts); for the preparation of esters, formamide, and dimethylformamide; and in the canning of juices.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

formic acid

[¦fȯr·mik ′as·əd]
(organic chemistry)
HCOOH A colorless, pungent, toxic, corrosive liquid melting at 8.4°C; soluble in water, ether, and alcohol; used as a chemical intermediate and solvent, in dyeing and electroplating processes, and in fumigants. Also known as methanoic acid.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

formic acid

a colourless corrosive liquid carboxylic acid found in some insects, esp ants, and many plants: used in dyeing textiles and the manufacture of insecticides and refrigerants. Formula: HCOOH
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Pathway 2: HCOOH [right arrow] [CO.sub.ads] + [H.sub.2]O [right arrow] C[O.sub.2] + 2[H.sup.+] + 2[e.sup.-]
This confirmed the formation of epoxide or oxirane rings from the reaction of performic (generated in situ by the reaction of HCOOH and [H.sub.2][O.sub.2]) with the C=C on the NR molecules.
The broad band at 3,401.2 [cm.sup.-1], 3402.3 [cm.sup.-1] and 3401.7 [cm.sup.-1] are due to the stretching O-H bond from HCOOH. The asymmetric stretching bands at 1644.3 cm1, 1645.2[cm.sup.-1], and 1644.8 [cm.sup.-1] are due to C=O bond in HCOOH.
For the oxidation process over metal oxide, Sekine (2002) proposed a mechanism including reversible transformation between HCHO and HCOOH, formation of intermediate formate, and further oxidation of formate into C[O.sub.2].
Para la separacion de la fraccion, se utilizo una bomba HPLCC Alliance 2795 (Waters[R], UK) con detector ultravioleta de diodos PDA 996 (Waters[R], UK), a las siguientes condiciones: Columna Symmeiry (Waiers) CC18 - 2,1 x 150 mm - 5 [micron]m + precolumna a 40[grados]C; solventes: solvente A ([H.sub.2]O + 0,17 HCCOOH) y solvente B (C[H.sub.3]OH + 0,17 HCOOH); gradiente: 0 a 45 minutos de corrido solvente A al 60% y solvente B al 40%; de los 45 a 50 minutos de corrido solvente A al 0% y solvente B al 100%, y de 52 a 65 minutos de corrido solvente A al 60% y solvente B al 40%.
Biochemically, N[O.sub.2.sup.-] can inhibit formate dehydrogenase, the enzyme responsible for the final step in the C[H.sub.4] oxidation pathway (HCOOH [??] C[O.sub.2]), and hence can reduce the supply of NADH in the cells (Jollie and Lipscomb 1991; King and Schnell 1994; Mancinelli 1995).
[CO.sub.2] + [H.sup.+] + [xe.sup.-] MetallicElectrode [right arrow] CO, HCOOH,[(COOH).sub.2],
The solvent rack (Dionex SRD-3600, Olten, Switzerland) carried the mobile phase A ([H.sub.2]O + HCOOH (100 + 0.1, v + v)) and phase B (MeCN + HCOOH (100 + 0.1, v + v)).
Bearing in mind the dual path mechanism, at low potentials, HCOOH oxidizes through the direct path with the simultaneous formation of C[O.sub.ad] through the indirect path.
The solvents used were water containing 0.1% HCOOH(solventA)and methanol containing 0.1% HCOOH (solvent B).
The elution was performed with [H.sub.2]O 0.1% HCOOH (solvent A) and MeOH (solvent B).