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C1909 Sigma-Aldrich

Citric acid monohydrate

ACS reagent, ≥99.0%

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Properties

Related Categories Acids, Acids & Bases, Building Blocks, C6, Carbonyl Compounds,
grade   ACS reagent
InChI Key   YASYEJJMZJALEJ-UHFFFAOYSA-N
assay   ≥99.0%
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: soluble54 % (w/w) at 10 °C (Citric acid in water)
  H2O: soluble59.2 % (w/w) at 20 °C (Citric acid in water)
  H2O: soluble84.0 % (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

Description

Packaging

1, 2.5 kg in poly bottle

12 kg in poly drum

25, 500 g in poly bottle

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.
It may be used:
• As release-modifying agent to improve the release of diltiazem hydrochloride from melt extruded Eudragit RS PO tablets.
• To prepare citrate buffer for use in the preparation of platelets for intravital microscopy.
• To prepare Tris-citrate buffer employed for the electrophoresis of bacterial enzymes.

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. It can be produced by crystallization from mother liquor of citric acid solution at 20-25°C during citric acid synthesis. An investigation of its crystal growth kinetics indicates that growth is linearly dependent on size.

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Safety & Documentation

Safety Information

Symbol 
GHS07  GHS07
Signal word 
Warning
Hazard statements 
Precautionary statements 
Personal Protective Equipment 
RIDADR 
NONH for all modes of transport
WGK Germany 
1
RTECS 
GE7810000
Flash Point(F) 
343.4 °F
Flash Point(C) 
173 °C
Protocols & Articles

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Peer-Reviewed Papers
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