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Merck Citric acid monohydrate

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100244.1000
for analysis EMSURE® ACS,ISO,Reag. Ph Eur 1KG.

Synonym(s): 2-Hydroxypropane-1,2,3-tricarboxylic acid, Hydroxytricarballylic acid

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Linear Formula:  HOC(COOH)(CH2COOH)2 · H2O

CAS Number:  5949-29-1

Molecular Weight:  210.14

Beilstein:  4018641

MDL number:  MFCD00149972

UNSPSC Code:  12352106

EC Index Number:  201-069-1

NACRES:  NA.21

grade:  ACS reagent

form:  solid

solubility:  880 g/L


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 (PO43-): ≤10 ppm

                       sulfate (SO42-): ≤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



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


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