If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
33114
Citric acid monohydrate
ACS reagent grade, 99.5-102%, solid, puriss. p.a., reag. ISO, reag. Ph. Eur., buffer substance
Synonym(s):
2-hydroxy-1,2,3-propanetricarboxylic acid monohydrate
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About This Item
Product Name
Citric acid monohydrate, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., buffer substance, 99.5-102%
Quality Segment
agency
USP/NF, reag. ISO, reag. Ph. Eur.
grade
ACS reagent, puriss. p.a.
assay
99.5-100.5% (calc. on anhydrous substance), 99.5-102%
form
solid
impurities
≤0.005% insolubles in water, ≤2 ppm heavy metals (as Pb), 7.5-9.0% water (Karl Fischer)
ign. residue
≤0.01% (as SO4)
pKa
(1) 3.13, (2) 4.76, (3) 6.4
anion traces
chloride (Cl-): ≤5 mg/kg, oxalate (C2O42-): ≤100 ppm, phosphate (PO43-): ≤10 mg/kg, sulfate (SO42-): ≤20 ppm
cation traces
Ca: ≤50 mg/kg, Cu: ≤5 mg/kg, Fe: ≤3 ppm, Pb: ≤2 ppm, Zn: ≤5 mg/kg
suitability
complies for appearance of solution, complies for reaction against H2SO4
SMILES string
OC(CC(O)(C(O)=O)CC(O)=O)=O.O
functional group
carboxylic acid
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
General description
1 of 1
This Item | |||
|---|---|---|---|
| description puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., buffer substance, 99.5-102% | description reagent grade, ≥98% (GC/titration) | description 99% | description anhydrous, free-flowing, Redi-Dri™, ACS reagent, ≥99.5% |
| grade puriss. p.a., ACS reagent | grade reagent grade | grade - | grade anhydrous, ACS reagent |
| assay 99.5-100.5% (calc. on anhydrous substance), 99.5-102% | assay ≥98% (GC/titration) | assay 99% | assay ≥99.5% |
| Quality Level 200 | Quality Level 300 | Quality Level 200 | Quality Level 200 |
| agency reag. ISO, USP/NF, reag. Ph. Eur. | agency - | agency - | agency - |
| form solid | form powder | form crystals | form crystals |
| impurities 7.5-9.0% water (Karl Fischer), ≤0.005% insolubles in water, ≤2 ppm heavy metals (as Pb) | impurities - | impurities - | impurities Substances carbonizable by hot sulfuric acid, passes test |
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Signal Word
Warning
Hazard Codes
Precautionary Statements
Hazard Classifications
Eye Irrit. 2 - STOT SE 3
Target Organs
Respiratory system
Storage Class
11 - Combustible Solids
Flash Point (°F)
345.0 °F - closed cup
Flash Point (°C)
173.9 °C - closed cup
PPE (personal protective equipment)
dust mask type N95 (US), Eyeshields, Gloves
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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