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di-Sodium hydrogen phosphate dihydrate, for analysis, ExpertQ®, Reag. Ph Eur

- Synonyms: Sodium monohydrogen phosphate, Sodium phosphate dibasic
- Na2HPO4·2H2O
- M = 177,99 g/mol
- CAS [10028-24-7]
- EINECS-No.: 231-448-7
- Solub. in water: (20 ºC): 93 g/l
- Melting point: 92,5 ºC (release of crystalline water)
- LD 50 (oral, rat): 17000 mg/kg (anhydrous substance)
- Tariff number: 2835 22 00 00
- Applications: analytical chemistry, in buffer solutions (phosphates).

SPECIFICATIONS
assay (acidimetric, referred to dried sample): 99,5 - 101,0 %
identification: passes test
appearance of solution: clear and colourless
pH (5 %, H2O): 9,0 - 9,2
chlorides (Cl): 0,001 %
sulfates (SO4): max. 0,005 %
total nitrogen (as N): max. 0,001 %
arsenic (As): max. 0,0004 %
copper (Cu): max. 3 ppm
heavy metals (as Pb): max. 0,001 %
iron (Fe): max. 0,001 %
potassium (K): max. 0,005 %
lead (Pb) : max. 0,0001 %
monosodium phosphate: max. 2,5 %
reducing substances: passes test
loss on drying (130 ºC): 19,5 - 21,0 %