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
C1909
柠檬酸 一水合物
ACS reagent grade, ≥99.0%, powder
同義詞:
2-hydroxy-1,2,3-propanetricarboxylic acid monohydrate
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產品名稱
柠檬酸 一水合物, ACS reagent, ≥99.0%
grade
ACS reagent
Quality Segment
assay
≥99.0%
form
powder
impurities
Substances carbonizable by hot sulfuric acid, passes test, ≤0.005% Insoluble matter
ign. residue
≤0.02%
pH
(1.8 at 50 g/l at 20 °C)
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
functional group
carboxylic acid
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
General description
一水柠檬酸是一种有机弱酸，在食品和饮料产品中用作天然防腐剂。
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本產品 | |||
|---|---|---|---|
| grade ACS reagent | grade ACS reagent, puriss. p.a. | grade reagent grade | grade - |
| assay ≥99.0% | assay 99.5-100.5% (calc. on anhydrous substance), 99.5-102% | assay ≥98% (GC/titration) | assay ≥99.5% |
| Quality Level 200 | Quality Level 200 | Quality Level 300 | Quality Level 200 |
| form powder | form solid | form powder | form powder |
| pH (1.8 at 50 g/l at 20 °C) | pH - | pH - | pH 1.85 (25 °C, 50 g/L) |
| 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 - | solubility H2O: 100 mg/mL, clear, colorless (Turbidity) | solubility H2O: 1 M, clear, colorless |
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signalword
Warning
hcodes
Hazard Classifications
Eye Irrit. 2 - STOT SE 3
target_organs
Respiratory system
存儲類別/等級
11 - Combustible Solids
wgk
WGK 1
flash_point_f
345.0 °F - closed cup
flash_point_c
173.9 °C - closed cup
ppe
dust mask type N95 (US), Eyeshields, Gloves
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How can I determine the shelf life / expiration / retest date of this product?
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I need to prepare 100 ml of 1 molar citric acid solution. How do I prepare this and which product do I need to buy?
1 answer-
The volume of 100 mL is equivalent to 0.1 Liters. And 1 molar (1 mole per liter) times 0.1 liters equals 0.1 moles. The molecular weight for Citric Acid Monohydrate is 210.14 grams per mole. And 0.1 moles times 210.14 grams per mole equals 21.0 grams. So to prepare the solution, dissolve 21.0 grams of citric acid monohydrate in about 75 mL of pure water, then bring the final volume to 100 mL. Citric Acid Monohydrate is very soluble in water.
As far as which product to buy, many grades of citric acid and citric acid monohydrate are listed. Please contact your local Technical Service group and describe your intended application so that they can help you choose the appropriate grade.Helpful?
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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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