Citric acid monohydrate

Product Name

Citric acid monohydrate, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., buffer substance, 99.5-102%

Quality Level

200

agency

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

grade

ACS reagent, puriss. p.a.

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-): ≤100 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

functional group

carboxylic acid

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