Synonyms | Tribasic sodium citrate |
Definition | |
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Einecs | 200-675-3 |
Chemical name | Trisodium citrate; Trisodium salt of 2-hydroxy-1,2,3-propanetricarboxylic acid; Trisodium salt of citric acid, in anhydrous, dihydrate or pentahydrate form |
Chemical formula | Anhydrous: C6H5O7Na3 Hydrated: C6H5O7Na3·nH2O (n = 2 or 5) |
Molecular weight | 258,07 (anhydrous) 294,10 (hydrated n = 2) 348,16 (hydrated n = 5) |
Assay | Not less than 99 % on the anhydrous basis |
Description | Crystalline white powder or colourless crystals |
Identification | |
Test for citrate | Passes test |
Test for sodium | Passes test |
pH | Between 7,5 and 9,0 (5 % aqueous solution) |
Purity | |
Loss of drying | Anhydrous: not more than 1,0 % (180 °C, 18 hours) Dihydrate: 10,0 to 13,0 % (180 °C, 18 hours) Pentahydrate: not more than 30,3 % (180 °C, 4 hours) |
Oxalates | Not more than 100 mg/kg expressed as oxalic acid, after drying |
Arsenic | Not more than 1 mg/kg |
Lead | Not more than 2 mg/kg |
Mercury | Not more than 1 mg/kg |