Properties: Monoclinic, prismatic needles or leaflets from water. d 1.625. Sublimes at 200°. Sublimes at 165° at 1.7 mm pressure. Partial carbonization and formation of maleic anhydride occur at 230° (open vessel). mp 287° (closed capillary, rapid heating). pK1 (25°): 3.03; pK2: 4.54. Absorption spectrum: Macbeth, Stewart, J. Chem. Soc.
111, 830 (1917). Soly in 100 g water at 25°: 0.63 g; at 40°: 1.07 g; at 60°: 2.4 g; at 100°: 9.8 g; in 100 g 95% alcohol at 30°: 5.76 g; in 100 g acetone at 30°: 1.72 g; in 100 g ether at 25°: 0.72 g. Almost insol in olive oil, chloroform, carbon tetrachloride, benzene, xylene, molten camphor, liq ammonia.
Melting point: mp 287° (closed capillary, rapid heating)
pKa: pK1 (25°): 3.03; pK2: 4.54
Density: d 1.625
Derivative Type: Monomethyl ester
Percent Composition: C 46.16%, H 4.65%, O 49.19%
Properties: Prisms from alc, mp 144.5°.
Melting point: mp 144.5°
Derivative Type: Dimethyl ester
Percent Composition: C 50.00%, H 5.59%, O 44.40%
Properties: Crystals, mp 102°. bp 192°.
Melting point: mp 102°
Boiling point: bp 192°
Use: Substitute for tartaric acid in beverages and baking powders; as a replacement or partial replacement for citric acid in fruit drinks. As an antioxidant. Manuf polyhydric alcohols, synthetic resins. As mordant in dyeing.
产品链接: 110-17-8››