grade

ACS reagent
puriss. p.a.

Quality Level

200

Agency

USP/NF
reag. ISO
reag. Ph. Eur.

Assay

99.5-100.5% (calc. on anhydrous substance)
99.5-102%

form

solid

impurities

≤0.005% insolubles in water
≤2 ppm heavy metals (as Pb)
7.5-9.0% water (Karl Fischer)

ign. residue

≤0.01% (as SO₄)

pKa 

(1) 3.13, (2) 4.76, (3) 6.4

anion traces

chloride (Cl^-): ≤5 mg/kg
oxalate (C₂O₄^2-): ≤50 ppm
phosphate (PO₄^3-): ≤10 mg/kg
sulfate (SO₄^2-): ≤20 ppm

cation traces

Ca: ≤50 mg/kg
Cu: ≤5 mg/kg
Fe: ≤3 ppm
Pb: ≤2 ppm
Zn: ≤5 mg/kg

suitability

complies for appearance of solution
complies for reaction against H₂SO₄

SMILES string

OC(CC(O)(C(O)=O)CC(O)=O)=O.O

InChI

1S/C6H8O7.H2O/c7-3(8)1-6(13,5(11)12)2-4(9)10;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);1H2

InChI key

YASYEJJMZJALEJ-UHFFFAOYSA-N