Merck
All Photos(5)

Documents

C1909

Sigma-Aldrich

Citric acid monohydrate

ACS reagent, ≥99.0%

Sign Into View Organizational & Contract Pricing

Synonym(s):
2-hydroxy-1,2,3-propanetricarboxylic acid monohydrate
Linear Formula:
HOC(COOH)(CH2COOH)2 · H2O
CAS Number:
Molecular Weight:
210.14
Beilstein:
4018641
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

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

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

Looking for similar products? Visit Product Comparison Guide

Related Categories

Compare Similar Items

View Full Comparison

Show Differences

1 of 4

This Item
C7129331141.00242
vibrant-m

C1909

Citric acid monohydrate

vibrant-m

C7129

Citric acid monohydrate

vibrant-m

33114

Citric acid monohydrate

vibrant-m

1.00242

Citric acid monohydrate

grade

ACS reagent

grade

reagent grade

grade

ACS reagent, puriss. p.a.

grade

-

assay

≥99.0%

assay

≥98% (GC/titration)

assay

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

assay

-

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

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

solubility

-

solubility

880 g/L

anion traces

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

anion traces

-

anion traces

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

anion traces

-

cation traces

Fe: ≤3 ppm, Pb: ≤2 ppm

cation traces

-

cation traces

Ca: ≤50 mg/kg, Cu: ≤5 mg/kg, Fe: ≤3 ppm, Pb: ≤2 ppm, Zn: ≤5 mg/kg

cation traces

-

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.

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

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.

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

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Documents related to the products that you have purchased in the past have been gathered in the Document Library for your convenience.

Visit the Document Library

Difficulty Finding Your Product Or Lot/Batch Number?

Product numbers are combined with Pack Sizes/Quantity when displayed on the website (example: T1503-25G). Please make sure you enter ONLY the product number in the Product Number field (example: T1503).

Example:

T1503
Product Number
-
25G
Pack Size/Quantity

Additional examples:

705578-5MG-PW

PL860-CGA/SHF-1EA

MMYOMAG-74K-13

1000309185

enter as 1.000309185)

Having trouble? Feel free to contact Technical Service for assistance.

Lot and Batch Numbers can be found on a product's label following the words 'Lot' or 'Batch'.

Aldrich Products

  • For a lot number such as TO09019TO, enter it as 09019TO (without the first two letters 'TO').

  • For a lot number with a filling-code such as 05427ES-021, enter it as 05427ES (without the filling-code '-021').

  • For a lot number with a filling-code such as STBB0728K9, enter it as STBB0728 without the filling-code 'K9'.

Not Finding What You Are Looking For?

In some cases, a COA may not be available online. If your search was unable to find the COA you can request one.

Request COA

Customers Also Viewed

Slide 1 of 8

1 of 8

Citric acid 99%

Sigma-Aldrich

C0759

Citric acid

Citric acid anhydrous, free-flowing, Redi-Dri™, ACS reagent, ≥99.5%

Sigma-Aldrich

791725

Citric acid

Citric acid, Anhydrous Pharmaceutical Secondary Standard; Certified Reference Material

Supelco

PHR1071

Citric acid, Anhydrous

Citric acid meets analytical specification of Ph. Eur., BP, USP, E330, anhydrous, 99.5-100.5% (based on anhydrous substance)

Sigma-Aldrich

27109

Citric acid

Citric acid anhydrous for synthesis

Sigma-Aldrich

8.18707

Citric acid

Eco-friendly rice husk pre-treatment for preparing biogenic silica: Gluconic acid and citric acid comparative study
Setiawan WK and Chiang KY
Chemosphere, 179, 130541-130541 (2021)
Size dependency of citric acid monohydrate growth kinetics.
Bravi M and Mazzarotta B.
Chemical Engineering Journal, 70(3), 203-207 (1998)
S Massberg et al.
The Journal of experimental medicine, 189(8), 1255-1264 (1999-04-20)
Atherosclerotic vascular lesions are considered to be a major cause of ischemic diseases, including myocardial infarction and stroke. Platelet adhesion and aggregation during ischemia-reperfusion are thought to be the initial steps leading to remodeling and reocclusion of the postischemic vasculature.
Sandra U Schilling et al.
International journal of pharmaceutics, 361(1-2), 158-168 (2008-06-28)
Incomplete drug release and particle size-dependent dissolution performance can compromise the quality of controlled release matrix systems. The objective of the current study was to investigate the ability of citric acid monohydrate (CA MH) to enhance the release of diltiazem
New perspectives for citric acid production and application.
Soccol CR, et al.
Food Technology and Biotechnology, 44(2), 141-149 (2006)

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service