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C1909

Sigma-Aldrich

Citric acid monohydrate

ACS reagent, ≥99.0%

Synonym(s):

2-hydroxy-1,2,3-propanetricarboxylic acid monohydrate

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25 G
409,00 kr
500 G
425,00 kr
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752,00 kr
2.5 KG
1 810,00 kr
12 KG
6 280,00 kr

409,00 kr


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25 G
409,00 kr
500 G
425,00 kr
1 KG
752,00 kr
2.5 KG
1 810,00 kr
12 KG
6 280,00 kr

About This Item

Linear Formula:
HOC(COOH)(CH2COOH)2 · H2O
CAS Number:
Molecular Weight:
210.14
Beilstein:
4018641
EC Number:
MDL number:
UNSPSC Code:
12352100
PubChem Substance ID:
NACRES:
NA.21

409,00 kr


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grade

ACS reagent

Quality Level

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 (C2O42-): passes test (limit about 0.05%)
phosphate (PO43-): ≤0.001%
sulfate (SO42-): ≤0.002%

cation traces

Fe: ≤3 ppm
Pb: ≤2 ppm

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

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1 of 4

This Item
33114C712927102
grade

ACS reagent

grade

ACS reagent, puriss. p.a.

grade

reagent grade

grade

-

assay

≥99.0%

assay

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

assay

≥98% (GC/titration)

assay

99.5-100.5% (based on anhydrous substance)

Quality Level

200

Quality Level

200

Quality Level

300

Quality Level

200

form

powder

form

solid

form

powder

form

grit

solubility

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

solubility

-

solubility

H2O: 100 mg/mL, clear, colorless (Turbidity)

solubility

-

anion traces

chloride (Cl-): ≤0.001%, phosphate (PO43-): ≤0.001%, oxalate (C2O42-): passes test (limit about 0.05%), sulfate (SO42-): ≤0.002%

anion traces

chloride (Cl-): ≤5 mg/kg, oxalate (C2O42-): ≤50 ppm, phosphate (PO43-): ≤10 mg/kg, sulfate (SO42-): ≤20 ppm

anion traces

-

anion traces

chloride (Cl-): ≤50 mg/kg, oxalate (as oxalic acid): ≤100 mg/kg, sulfate (SO42-): ≤100 mg/kg

General description

Citric acid monohydrate is an organic acid. Its molar enthalpy of solution in water has been reported to be ΔsolHm (298.15K, m = 0.0203molkg-1) = (29061±123)Jmol-1.[1] It can be produced by crystallization from mother liquor of citric acid solution at 20-25°C during citric acid synthesis.[2] An investigation of its crystal growth kinetics indicates that growth is linearly dependent on size.[3]

Citric acid monohydrate is an organic weak acid used as a natural preservative in food and beverage products.[4]

Application

Citric acid monohydrate was used in the preparation of citric acid solution employed in the acetone method of 68Ga pre-purification and radiolabeling technique.[5]
It may be used:
  • As release-modifying agent to improve the release of diltiazem hydrochloride from melt extruded Eudragit RS PO tablets.[6]
  • To prepare citrate buffer for use in the preparation of platelets for intravital microscopy.[7]
  • To prepare Tris-citrate buffer employed for the electrophoresis of bacterial enzymes.[8]

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Eye Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

345.0 °F - closed cup

Flash Point(C)

173.9 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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