Citric acid monohydrate

grade

ACS reagent

Quality Level

200

Assay

≥99.0%

form

powder

impurities

Substances carbonizable by hot sulfuric acid passes test
≤0.005% Insoluble matter

ign. residue

≤0.02%

pKa 

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

solubility

H₂O: soluble 54 % (w/w) at 10 °C (Citric acid in water)
H₂O: 59.2 % (w/w) at 20 °C (Citric acid in water)
H₂O: 84.0 % (w/w) at 100 °C (Citric acid in water)

anion traces

chloride (Cl^–): ≤0.001%
oxalate (C₂O₄^2-): passes test (limit about 0.05%)
phosphate (PO₄^3-): ≤0.001%
sulfate (SO₄^2-): ≤0.002%

cation traces

Fe: ≤3 ppm
Pb: ≤2 ppm

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