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Citric Acid, Anhydrous

anhydrous Meets ACS Specifications, Meets Reagent Specifications for testing USP/NF monographs GR ACS

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Synonym(s):
Citric acid
Linear Formula:
HOC(COOH)(CH2COOH)2
CAS Number:
Molecular Weight:
192.12
Beilstein/REAXYS Number:
782061
MDL number:
EC Index Number:
201-069-1

agency

meets USP/NF

Quality Level

vapor pressure

<0.1 hPa ( 20 °C)

assay

99.5-100.5% dry basis (alkalimetric)

form

fine powder

expl. lim.

8 %, 65 °F

impurities

≤0.005% Water-insoluble matter
≤1% Water (Karl Fischer)

sulfated ash (600 °C)

≤0.02%

color

white to almost white

pH

1.7 (20 °C, 100 g/L in H2O)

pKa 

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

bp

200 °C/1013 hPa (decomposition)

mp

153-159 °C (lit.)

solubility

1330 g/L

density

1.67 g/cm3 at 20 °C

anion traces

chloride (Cl-): ≤0.001%
oxalate (C2O42-): ≤0.036%
phosphate (PO43-): ≤0.001%
sulfate (SO42-): ≤0.002%

cation traces

Fe: ≤0.0003%
Pb: ≤0.0002%

shipped in

ambient

storage temp.

room temp

SMILES string

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

InChI

1S/C6H8O7/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)

InChI key

KRKNYBCHXYNGOX-UHFFFAOYSA-N

Related Categories

Application

anhydrous Meets ACS Specifications, Meets Reagent Specifications for testing USP/NF monographs GR ACS

Analysis Note

Appearancewhite to almost white, fine powderAssay (alkalimetric on dried substance)99.5-100.5%Chloride (Cl)0.001% maxIdentity (IR-spectrum)passes testIron (Fe)0.0003% maxLead (Pb)0.0002% maxOxalate (C2O4)0.036% maxPhosphate (PO4)0.001% maxReadily carbonizable substancespasses testSulfate (SO4)0.002% maxSulfated ash (600°C)0.02% maxWater (acc. to Karl Fischer)1.0% maxWater-insoluble matter0.005% max

pictograms

Exclamation mark

signalword

Warning

Hazard Classifications

Eye Irrit. 2 - STOT SE 3

target_organs

Respiratory system

Storage Class

11 - Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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