1.00244

Citric acid monohydrate

for analysis EMSURE^® ACS,ISO,Reag. Ph Eur

• Synonym(s): 2-Hydroxypropane-1,2,3-tricarboxylic acid, Hydroxytricarballylic acid
• Linear Formula: HOC(COOH)(CH₂COOH)₂ · H₂O
• CAS Number: 5949-29-1
• Molecular Weight: 210.14
• Beilstein/REAXYS Number: 4018641
• MDL number: MFCD00149972
• UNSPSC Code: 12352106
• EC Index Number: 201-069-1
• NACRES: NA.21

Properties

• grade: ACS reagent
• Quality Level: 300
• agency: reag. ISO; reag. Ph. Eur.
• vapor pressure: <1 Pa ( 25 °C)
• product line: EMSURE^®
• assay: 99.5-100.5% anhydrous basis (acidimetric)
• form: solid
• potency: 3000 mg/kg LD₅₀, oral (Rat)
• composition: Water, 7.5-8.8% Karl Fischer
• impurities: ≤200 ppm Sulfated ash; ≤50 ppm In water insoluble matter
• color: clear; white to almost white
• pH: 1.85 (25 °C, 50 g/L in H₂O)
• pKa: (1) 3.13, (2) 4.76, (3) 6.4
• mp: 135-152 °C
• transition temp: flash point 173.9 °C
• solubility: 880 g/L
• density: 1.54 g/cm³ at 20 °C
• bulk density: 800‑1000 kg/m³
• anion traces: chloride (Cl^-): ≤5 ppm; oxalate (as oxalic acid): ≤50 ppm; phosphate (PO₄^3-): ≤10 ppm; sulfate (SO₄^2-): ≤20 ppm
• cation traces: Al: ≤0.2 ppm; As: ≤1 ppm; Cu: ≤5 ppm; Fe: ≤3 ppm; Hg: ≤1 ppm; Pb: ≤0.5 ppm; heavy metals (as Pb): ≤5 ppm
• storage temp.: 2-30°C
• 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

Description

Application

• Biopolymeric Blends of Thermoplastic Starch and Polylactide as Sustainable Packaging Materials: This publication uses citric acid monohydrate in the synthesis of biodegradable polymers, highlighting its utility in developing sustainable materials within the industrial manufacturing and environmental sectors (Jozinović A et al., 2024).

Linkage

Replaces: CX1725-1; CX1725-3; CX1725

Analysis Note

Assay (acidimetric, calc. on anhydrous substance): 99.5 - 100.5 %
Identity (IR-spectrum): passes test
Appearance: white to almost white or colorless crystals
Appearance of solution (200 g/l; water): clear (≤ 3 NTU) and not more intense in color than reference solution Y₇, BY₇ or GY₇
In water insoluble matter: ≤ 50 ppm
Chloride (Cl): ≤ 5 ppm
Phosphate (PO₄): ≤ 10 ppm
Sulphate (SO₄): ≤ 20 ppm
Heavy metals (as Pb): ≤ 5 ppm
Al (Aluminium): ≤ 0.2 ppm
As (Arsenic): ≤ 1 ppm
Hg (Mercury): ≤ 1 ppm
Cu (Copper): ≤ 5 ppm
Fe (Iron): ≤ 3 ppm
Fe (Iron, acc. to Reag. Ph  Eur.): suitable to use in the limit test for iron
Pb (Lead): ≤ 0.5 ppm
Oxalates (as C₂H₂O₄): ≤ 50 ppm
Readily carbonisable substance: passes test
Sulfated ash: ≤ 200 ppm
Water (according to Karl Fischer): 7.5 - 8.8 %
Corresponds to ACS, ISO 6353/2, Reag. Ph. Eur.

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• pictograms: GHS07
• signalword: Warning
• hcodes: H319,H335
• pcodes: P261 - P264 - P271 - P280 - P304 + P340 + P312 - P305 + P351 + P338
• Hazard Classifications: Eye Irrit. 2 - STOT SE 3
• target_organs: Respiratory system
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: 345.0 °F - closed cup
• flash_point_c: 173.9 °C - closed cup