Molecular formula: C6H8O6 Molecular weight: 176.13Properties: White oblique crystal powder; melting point: 190192; no odor and acidtaste; light yellow if placed for long duration; freely soluble in water, slightly solublein ethanol, not soluble in aether and chloroform; its aqueous solution is acid; 5(W/V);PH: 2.1-2.6; the specific rotation of 10 (W/V): 20.5.∼21.5. Standard: BP2000/USP26, CP2000 Package: Net weight 25Kg per paper bucket or carton, one-layer kraft paper and doubledplastic bag lined.