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di-Sodium oxalate, secondary standard for volumetric titrations, Titrasure®

- Synonyms: Oxalic acid sodium salt, Soerensen's buffer substancesr- Na2C2O4r- M = 134,01 g/molr- CAS [62-76-0]r- EINECS-No.: 200-550-3r- Solub. in water: (20 ºC): 37 g/lr- Melting point: 250 - 270 ºC (decomposes)r- LD 50 (oral, rat): 7500 mg/kg (oxalic acid)r- EC-Index-No.: 607-007-00-3r- GHS-signal word: Warningr- GHS-H sentences: H302 - H312r- GHS-P sentences: P280 - P264 - P270 - P321 - P301+P312 - P501ar- Tariff number: 2917 11 00 99r- Applications: analytical chemistry, reference material.r- Appearance: White solidrrSPECIFICATIONSrassay (on dried sample): min. 99,7 %rinsoluble in water: max. 0,005 %rneutrality: passes testrchlorides (Cl): max. 0,002 %rsulfates (SO4): max. 0,002 %rammonium (NH4): max. 0,002 %rheavy metals (as Pb): max. 0,002 %riron (Fe): max. 0,001 %rpotassium (K): max. 0,005 %rsubstances darkened by H2SO4: passes testrloss on drying : max. 0,01 %rrThis standard solution is traceable to Standard Reference Material from NIST. r