isophthalic acid,121-91-5

Isophthalic acid

1,3-Benzenedicarboxylic acid;Isophthalic acid;m-Benzenedicarboxylic acid;m-Phthalic acid;m-Dicarboxybenzene;m-Carboxybenzoic acid;Isoterephthalic acid;m-Phthalic acid;3-Carboxybenzoic acid;NSC 15310;55185-18-7;2088100-84-7

121-91-5

C8H6O4

InChIKey=QQVIHTHCMHWDBS-UHFFFAOYSA-N

16613

166.13

204-506-4

X35216H9FJ

0500

15310

DTXSID3021485

Crystalline powder|Colorless crystals|Needles from water or alcohol

29173980

Organic Reagents

74.6

1.7

White to off-white; Crystalline Powder

1.507 g/cm³ @ Temp: 20 °C

347 °C

100 °C

217.3±20.5 °C

1.5100 (estimate)

H2O: 001 g/100 mL (25 ºC)

Store below +30°C

2.6X10-8 mm Hg at 25 deg C(est)

Henry's Law constant = 2.18X10-12 atm-cu m/mol at 25 °C(est)

pKa1 = 3.70; pKa2 = 4.60 at 25 °C

Heat of formation: -802 kJ/mol at 25 °C|Heat of sublimation: 106.7 kJ/mol at 25 °C|log Kow = -2.34 at pH 7 (OECD 107 method)|Hydroxyl radical reaction rate constant = 1.3X10-12 cu cm/molecule-sec at 25 °C (est)

Dust forms explosive mixture in air (USCG, 1999).

Acids, Carboxylic

ISOPHTHALIC ACID is a carboxylic acid. Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water; those with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in it to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymerization reactions; like other acids, they often catalyze (increase the rate of) chemical reactions.

700 °C

Dust explosion possible if in powder or granular form, mixed with air.

1.0921X10+8 J/kmol at the melting point of 619.15 K (346 °C)

Critical temperature = 1007.00 K; Critical pressure = 3.9500X10+6 Pa